Frogpond - Add to, explore & share consumers' opinions

Backupreview - Indexes hundreds of local & international back-up & storage companies

Altsearchengines - Index & reviews of search engines

Polycola - Meta search

Fidgt* - Create a dynamic address book to keep track of your contacts across multiple social networks, and visualise what everybody is talking about

Web 2.0 alphabetical: from 1001 to 9rules and from A9 to Bytemycode

Italic = new to this index.

1 - 9
1001 - Flickr update service - Images
1000tags - Tag cloud based search - Search
123businesscards - Design & print your business cards on demand - Software
14dayz - Track & manage time - Office
16bugs - Track bugs easily - Software
1millionsentencesxista - Buy a sentence and increase traffic - Marketing
1time - Organize & manage projects - Productivity
1zone - Submit & rate gay news - Rate
20culture - Article on Web 2.0 design trends - About
20websites - Categorized lists of Web 2.0 phenomena - About
23hq - Store, share & manage photos - Identity
24eyes~ - Personalize your start page or subscribe to someone else's - Startpage
24sevenoffice - Web-based crm & erp - CRM
2prong - Get email address for 24 hrs - Communicate
2recall* - Record calls on any phone (USA) - Communicate
2rsscom - RSS feed directory - RSS
301url - Shorten your url - Software
30boxes - Manage & share calendar - Office
30daytags - Fresh tagclouds - Tag
30gigs - Store your data - Store
31left - Publish and share new year's resolutions - Publish
37signals* - Basecamp, Backpack, Writeboard, Ta-da List - Productivity
3B - 3D web browser - Browse
3bubbles - Add chat to your blog - Communicate
3jam - One to many texting - Communicate
3spots - Lists many Web 2.0 apps & websites - About
3voor12~** - Profile yourself & share media - Multimedia
41day - Send your email later - Communicate
43deals - Find best deals - Ecommerce
43people - Tag based matching & dating - Community
43places - Publish & share stories about places - Community
43things - Publish, share, find your goals - List
451press - Write a blog, and get a rev share - Economy
4shared - Upload & share files - Store
5min - Upload, explore & share how to-videos ('videopedia') - Knowledge
5minutefriend - Videochat for 5 minutes with random users - Communicate
6-Clicks - Add keywords to websites - Bookmark
71miles - Read & contribute to regional travel portals - Community
7tipson - Browse & share tips - Knowledge
88miles - Track & manage time - Office
8apps - Collaboration tools - Productivity
8by1 - Share your wish - List
8hands - Profile aggregator - Identity
97tags - Own a tag exclusively - Tag
99moments - Collaborate on & share a timeline of events & experiences - Office
9cays - Group email2web - Communicate
9minutesoffame - Submit your blog & get 9 minutes exposure - Marketing
9rules - Validate & share links to content - Bookmark

AAA
A1-webmarks - Social bookmarking - Bookmark
A9** - Clustered search - Search
Abaqueinside - Catalogue ware - Software
Abazab - Upload & share your vids - Video
Abcde… - Get the longest email-address - Communicate
Abiword - Web-based word processing (download) - Office
Able2know - Q&A - Knowledge
Abouturl - Aggregates many site tests - Software
Aboutus - Wiki about websites - List
Abstractmouse - Social bookmarking - Bookmark
Academiclive - Search academic articles - Search
Accoona - A.I. Enhanced search - Search
Acorn - Map your mind - Productivity
Actionapps - Content management system - Software
Actionthis - Organize & manage projects - Productivity
Activeallowance - Kids & parents manage kids' allowances - Finance
Activecollab - Collaboration & project management tool (free) - Software
Activegrid - Integrate services into Web 20 applications - Software
Activeroll - Linkroll wizard - RSS
Activerssreader - RSS reader (Windows) - RSS
Acuityscheduling - Manage your time - Office
Adaction - Search me - Search
Adahead - Marketplace for advertisers & affiliates - Marketing
Adaptiveblue - Collect & manage favourite things - List
Adbrite - Make some money on accepting contextual ads on your blog or website - Marketing
Addictingclips - Upload, watch & share multimedia - Multimedia
Addthis - Collect 'all' information with one button - Bookmark
Addtoany - Meta RSS button linking to major bookmarking services - RSS
Adgenta - Add ads to your site, blog or rss feed - Ecommerce
Adgridnetwork - Ad exchange - Marketing
Adjustables~** - Super impose clickable logos, banners, ticker tapes etc on video - Marketing
Adknowledge - Make some money on accepting ads on your blog or website, in email newsletters, etc - Marketing
Admob - Buy or sell mobile advertising - Marketing
Adobesoundbooth - Create & edit audio (client) - Software
Adoppt - Publish & share - Community
Adplosion - Make some money on accepting ads on your blog or website - Marketing
Adsmarket - Make some money on accepting ads on your blog or website - Marketing
Aduim - Instant messenger (client, Mac) - Communicate
Adultswim - Episode previews, games, community - Video
Aduna~ - Visualize search results - Search
Adveracious - Digg advertising news - Rate
Advertlover - Submit & rate advertising - Rate
Advisorgarage - Connects entrepreneurs to advisors - Economy
Aegeetv~ - Create & share video (for European students) - Video
Afeeda - RSS mixer - RSS
Affiliatefuel - Make some money on accepting ads on your blog or website - Marketing
Affiliatefuture - Make some money on accepting ads on your blog or website - Marketing
Aftervote - Meta search inc several rankings - Search
Aftervote - Meta search inc several rankings - Search
Agentb - Submit & rate deals - Rate
Agester - Let other users tell how old you look - Community
Aggrega*** - Upload to, listen to & share Pandora for music videos - Audio
Aggregateknowledge - Recommendation engine - Productivity
Aggrssive - Share your mixed feeds - RSS
Agile - Mobile instant messenger - Communicate
Agilerss - RSS reader (Linux) - RSS
Agloco - Subscribe to portal & get paid for it - Marketing
AI3 - Articles & lists re semantic softwares - About
Aidpage - People help people - Economy
Aim - Myspace for AOL users - Community
Aimexpress - Instant messenger (web based) - Communicate
Airset - Manage & share calendars, contacts, groups - Productivity
Airtroductions - 8 miles high dating - Date
Ajax - Mozilla developer community - Software
Ajax13 - Create, edit & share your presentations - Office
Ajaxian** - Ajax blog - About
Ajaxilicious - Share your movies thru RSS - Video
Ajaxload - Generates animated Ajax load gifs - Software
Ajaxpatterns - Ajax wiki - Software
Ajaxrain - Repository of Javascript & Dhtml samples & demos - Software
Ajax-s - Compile & share presentations - Office
Ajaxshowcase - Aggregates Ajax applications - Software
Ajaxsketch - Create drawings & diagram - Design
Ajaxwhois - Results while you type - Search
Ajaxxls - Spreadsheet in Ajax - Office
Ajchat - Create chat rooms - Communicate
Akregator - RSS reader (Linux) - RSS
Alamy - Search stock images - Search
Albumart - Search for CD and DVD covers - Search
Alertbear - Customize your feeds - RSS
Alesti - Feed reader - RSS
Alexadex* - Buy & sell shares in sites - Game
Alexscoupons - Find coupon deals - Marketing
Alivebroadcast - Upload & share personal webcam photos - Images
Alkemis - Map mash-up - Geo
Allaboutsport - Submit & rate sport news - Rate
Allconsuming - List & share everything you like - List
Allexperts - Q&A - Knowledge
Allfreecalls - Make free calls from the USA - Communicate
Allmydata - Store & share your data - Store
Allmyfavorites - Social bookmarking - Bookmark
Allpeers - Upload & share your media (Czech) - Multimedia
Allspotsmarket - Sports stock market - Gamble
Allthecode - Search code - Software
Allthingsweb2 - Extensive list of Web 2.0 companies, based on my first listings - About
Allyoucanupload - Manage your photos - Images
Allyourwords - Associate & share words with links - Bookmark
Almondrocks - Share feeds - RSS
Alpinaut - Search route maps - Search
Alternativee - Submit & rate articles about alternative energy - Rate
Altsearch - Categorized list of Web 2.0 companies that are also in THIS list - About
Alumwire - Job board for college graduates and young alumni - Employment
Amateurillustrator - Publish, rate & rank illustrations - Community
Amazon* - Shop, sell, review & rank - Ecommerce
AmazonEC2 - Provides resizable computing capacity - VAS
Amazonfps - Neutral (micro)payment system - VAS
Amazontreemap - Treemap example with "All Digital Cameras"; many more at this link - Data
Amazonwebservices - Unlimited storage - Store
Amaztype - Create typeface from word-relevant book covers (Amazon mash-up) - Images
Ambedo - Bookmark, tag & search - Search
Amberjack - Create & publish site tours - Software
Ambientdevices* - Datacasting inc. interfaces - Data
Amiamo - Find things & people you like - Community
Amiestreet - Music market (price increases with popularity) - Audio
Amiglia - Publish & share family trees, photos, maps… - Community
Amigo - Matches advertisers with email newsletters - Marketing
Amigofish - Rate, recommend & share podcasts - Audio
Amiko - Online resume generator - Employment
Ampminsure - Submit & rate insurance information & help each other - Rate
Amsn - Instant messenger (Linux) - Communicate
Amvona - Publish, manage & share your photos - Images
Ándale - Small online business sales tools - Ecommerce
Angelbackup - Backup service - Store
Aniboom - Create, upload, rate & rank animation movies - Video
Annologger - Publish & share announcements - Publish
Annotea - Create & share metadata - Knowledge
Annoyances - Q&A on Windows - Knowledge
Anobii - Publish, share & discover booklists - List
Anoox - Majority vote optimized search - Search
Anothr - Manage & read feeds in Skype messenger - RSS
Answerlytics - Q&A - Knowledge
Answers - Best answers to your questions - Knowledge
Answeru - Q&A on education - Knowledge
Aolvideo - Search video - Search
Apachecocoon - Web development framework without programming - Software
Apachelenya - Content management system - Software
Apachestruts - Open-source framework for Java web apps - Software
Apachewicket - Java web app framework - Software
Apartmentratings - Rent after reading tenant's review & rating - Ecommerce
Apbnews - Submit & rate crime news - Rate
Apidashboard* - Programmable Web's repository of APIs - About
Apollo - Adobe RIA development platform - Software
Appaholic** - Pop index for Facebook apps - About
Appfuse - Open-source framework for Java web apps - Software
Appingo - Make money as an editors or proof readers - Economy
Applewebobjects - Rapid application development environment - Software
Applian - Capture streaming audio & video - Software
Approver - Share & work on documents online - Office
Aptanaradrails - Development environment for Ruby on Rails apps - Software
Aptela - Voicemail2web - Communicate
Aranea - Open-source framework for Java web apps (object-oriented) - Software
Arcaplay - Rate & share games - Game
Ariadne - Content management system - Software
Arise - Make money on providing support - Economy
Artfaceoff - Strives to emulate natural intelligence thru accumulated experience - Rate
Articlesphere - Submit & rate news articles (categorised) - Rate
Arunalabs - Store & send - Store
Askalexia - Ajax interface to Alexia.com - Search
Askalibrarian - Q&A (Library of Congress) - Knowledge
Askaninja - Got questions? Ask a ninja! - Video
Askeet - Ask & answer it - Knowledge
Askitonline - Create & conduct online surveys - Survey
Askmaps - Get driving directions - Geo
Askmehelpdesk - Provides answers & get tipped - Knowledge
Asktheworld - Q&A - Knowledge
Askville - Q&A by Amazon - Knowledge
Askvox - Write a question & hear the answer - Knowledge
Asoboo - Find people & places in your city - Productivity
Associatedcontent - Make money on your multimedia content - Economy
Associatedcontent - Produce & publish content, get paid - Economy
Asterisk* - Open source phone system (free) - Software
Ataja - Shorten your url - Software
Athyrium - Personal organizer - Productivity
Atiki - Tag based feed search - RSS
Atlarge - Read & write about web access at airports - Wi-fi
Atnewz - Create your own rating website - Software
Atoolo - Customizable startpage - Startpage
Attendr - Mash-up your conference or party - Community
Attensa - Read & share feeds enterprise-wide through Outlook - RSS
Attentiontrust - Advertising based on mutual understanding - Marketing
Attentv - Subscribe to other persons' clickstreams or start your own station - Video
Auctionmapper - Find auctioned goods nearby (mash-up) - Ecommerce
Audioclipping* - Search AV (German) - Search
Audiodizer - Text2Speech podcasts from your blog - Audio
Audiolunchbox - Music download store - Audio
Audiosnacks - Create, share & download audio travel tours - Audio
Audiozue - Publish your iTunes playlist to Myspace or your blog - Audio
Audiri - Recommend & share your media - Multimedia
Aukyla~ - Platform for web-based PHP apps - Software
Authenticjobs - Job board for web designers - Employment
Authorstream - Create, edit & share your presentations - Office
Autopinger - Ping service - RSS
Autospies - Digg cars - News
Avangate - Sell your software online - Marketing
Averageshoveler - Game & RSS news mash-up - Game
Averiware - CRM solution - CRM
Avidbeauty - Share photos & sounds - Multimedia
Avvenu - Remote access to your computer - Office
Avvo - Something legal (stealth) - VAS
Awasu - RSS reader (Windows) - RSS
Aytozon - Comparison shopping from Amazon & Ebay - Ecommerce
Aytozon - Ebay + Amazon metasearch - Search
Ayttm - Instant messenger - Communicate
Azareus - Distribute bandwidth & share content - Software
Azoogleads - Make some money on accepting ads on your blog or website - Marketing

BBB
B2evolution - Blog solution - Publish
Babble - Word game community - Game
Backbase* - Ajax applications - Software
Backfence - Publish & share community news - Rate
Backflip - Social bookmarking - Bookmark
Backgroundimagemaker - Create backgrounds - Design
Backseatplayground - ARG using GPS for gameplay in real world (documentary video) - Game
Badged - Add your social networking badges to your blog - Community
Baeboo - Shop comparison - Ecommerce
Bagborroworsteal - Get a handbag each month for a few bucks & let it circulate - Economy
Ballbug - Memeorandum for baseball - News
Bandbuzz - Explore & rate music playlists - Rate
Barablu - Free or cheap calls, IM, chat etc. thru mobile & web - Communicate
Barcamp - Ongoing interactive event - Productivity
Barcardz - Network in real life - Community
Barks - Social bookmarking for news - Bookmark
Basecamp - Manage your projects - Productivity
Bashr - Wikipedia, Flickr & Delicious mash-up - Search
Battleofconcepts~ - Help companies to innovate or solve problems; and win - Economy
Battleout - Challenge & vote for best, biggest etc. whatever - Community
Bayimg - Upload, store & manage your photos - Images
B-boys - Submit & rate hiphop - Rate
Bbpress - Publish & manage your forum - Communicate
Bconnections - CRM solution - CRM
Beagoodbuzz - Post & share good buzzes - Marketing
Beaguide - Make money on writing articles - Economy
Beamfile - Email big files - Office
Beanrocket - News reader - RSS
Beatport - Music download store - Audio
Bebo - Find back school & college friends - Community
Bebop - Compare music calendar against your iTunes catalogue - Audio
Become - Collective shopping search - Search
Bedsharing - Get a bed when travelling (well designed variation on Couchsurfingcom) - Economy
Beedeo - Upload & share videos - Video
Beeplet~ - Set up reminders & get alerts - RSS
Beetagg - Scan branded sema code with your cell to get access to website - Marketing
Beetobee - Digg what works in B2B marketing (also offers solution for enterprise 'thought leadership communities' - cf. http://www.beetoobee.com/productsite/) - Rate
Beggr - Give me your money - Finance
Begreen - Here it's easy being green - Community
Beinsync - Backup & access all files anywhere - Store
Bessed - Search & blog - Search
Bestofbest - Categorized best of best 2.0 websites - About
Bestvotexxx - Submit & rate porn - Rate
Betabug - Bug tracking community - Software
Betamarker - Digg software - Rate
Betbug - Betting exchange - Gamble
Betbull - Betting exchange - Gamble
Betdaq - Betting exchange - Gamble
Betfairgames - Bet on poker and blackjack games - Gamble
Betfairpoker - Poker community - Gamble
Betmate - Betting exchange - Gamble
Betocracy - Create your own decision markets - Gamble
Betonbet - Bet on sports, poker & casino games - Gamble
Betsgowild* - Cash-free betting community - Gamble
Betsson - Betting exchange, poker & casino tournaments - Gamble
Betterdesktop - Share usability tests - Design
Bettingmarket - Article on P2P betting - About
Beyond** - Career management software, facilitating 15,000 niche sites & job boards - Employment
Bibli - Publish & share texts - Publish
Bibliochat - Get book excerpts and reviews, and discuss books - live - Community
Bibliophil - List your books & share - List
Bibme** - Build a bibliography on the web - Data
Bibsonomy - Share bookmarks & literature lists - List
Bibster - Search, share & manage bibliographic metadata - Search
Bidvertiser - Make some money on accepting ads on your blog or website - Marketing
Big - Big search results - Search
Bigbluesaw - Submit cad design & get product delivered - Personal manufacturing
Bigcartel - Start, review & recommend online shops - Ecommerce
Bigcartel - Web stores for creative people - Software
Bigcite - Publish & share quotes - Publish
Bigcontact - Publish your videos & mp3s - Multimedia
Bigcontacts - Upload, annotate & share your contacts - Office
Bigfilebox - Store & share - Store
Bigfilez - Store & send - Store
Biggerboat - Search entertainment - Search
Biginjapan - Social media tools - Software
Bigoven - Publish & share recipes - Publish
Bigstockphoto - Upload your images, have them reviewed & sell them - Images
Bigupload - Store & send - Store
Billhighway - Budget, collect, pay between roommates, fraternities, etc. - Finance
Billmonk - Manage debts - Economy
Billq - Keep track of your bills - Finance
Billster - Track where your money goes - Finance
Binarylaw - Submit & rate legal news - Rate
Bioteams* - Blog on team dynamics & virtual collaboration - About
Birthdayforever - Manage & share your wishlist & photos - List
Bitbomb - Web2SMSs reminders - Office
Bitlbee - IRC clients using IM protocols - Communicate
Bitsofnews - Submit, read, rank & discuss news - Rate
Bittercyclist - Bicycle accident map & community; map mash-up - Geo
Bittorrent - Share files & bandwidth - Office
Bitty - Embed content from web services - Publish
Bitweaver - Content management system for communities and enterprise - Software
Bitwine - Get or give video advice for a price - Knowledge
Bitwise - Encrypted instant messaging - Communicate
Bix* - Create & vote for content, and win - Multimedia
Bixee - Job finder - Employment
Biznik - Business network - Community
Bizzbites - Submit & rate business news - Rate
Blabb - Social bookmarking - Bookmark
Blablalist - Manage tasks - Office
Blackplanet - Community for African-Americans - Community
Blast - Promote your site for free - Marketing
Blastfeed - Only get the feeds that matter to you - RSS
Bleep - Music download store - Audio
Blendsforfriends - Order your own blend of tea - Ecommerce
Bliin~ - Share your experience in photos, videos, text etc - Geo
Blinkbits - Share knowledge - Knowledge
Blinkist - Social bookmarking - Bookmark
Blinklife*** - Social email - Communicate
Blinklistsocial - Lists of 2.0 websites - About
Blinkr - Digg design - Rate
Blinksale - Web-based invoicing - Finance
Blinkx - Personalized epg - Video
Blip - Get video & podcasting on your blog - Publish
Blipfoto - Publish your phlog - Publish
Blipstar - Create your own store locator - Geo
Bliptv - Upload, explore, rate & share videos - Video
Blish - Buy or sell your media - Ecommerce
Bliss - Customize game to couple’s needs - Game
Blnk - Publish & share your profile and make new friends - Community
Blobber - Communicate with other site visitors - Communicate
Blockhunter - Find, sell or let a home & avoid real estate agents - Ecommerce
Blockrocker - Buy & sell thru classifieds; map mash-up - Ecommerce
Blocksavvy - Habbo for adults - Game
Blog - Publish your blog - Publish
Blogabond - Publish your travel blog (map mash-up) - Publish
Blogads - Make some money on accepting ads on your blog or website - Marketing
Blogbackuponline - Backup service - Store
Blogbar - Searches your blog and the web - Search
Blogbeat - Compare websites' Alexa rankings (formerly known as Alexaholic) - Data
Blogbridge - Feed reader - RSS
Blogburner - Write a blog, and get a rev share - Economy
Blogburst - Syndicate blogs to mainstream media sites - Publish
Blogbuy - Social market place - Ecommerce
Blogbuzzmachine - Blog search - Search
Blogcatalog - Blog directory - Search
Blogcheese - Publish video on your blog - Video
Blogcode - Start blog & find similar ones - Publish
Blogdex - Folksonomied blog topics selection - News
Blogdigger - RSS feed directory - RSS
Blogelo - Rate & share websites - Bookmark
Blogetery - Publish your blog - Publish
Blogexpress - Feed reader - RSS
Blogflux - RSS ping tool - RSS
Blogger - Publish your blog - Publish
Bloggerkit - Let Amazon exploit your blog - Ecommerce
Bloggersnap - Add your webcam snapshot to any blog - Publish
Bloggerwave - Make money on writing reviews on your blog - Economy
Bloggingads - Make some money on accepting ads on your blog or website - Marketing
Bloggoggle - Categorize & rate pro bloggers - List
Bloginfluence - Let your art compete with other artists' submissions - Rate
Blogitive - Make money on writing articles on your blog - Economy
Blogladder - Publish your blog - Publish
Blogladder - Create & maintain your blog - Publish
Bloglebrity - Compute your blog's influence - Fun
Bloglet - Blog update notifications thru email - Publish
Bloglines - RSS readers (web based, mobile) - RSS
Blogmailr - Use email to send blogposts - Publish
Blogmarks - Social bookmarking - Bookmark
Blogmemes - Vote for & share memes - Rate
Blogmusik - Explore music - Audio
Blogniscient - Rate your influence in the blogosphere - Rate
Blogoforum - Categorize your forum by tagging - Communicate
Blogprinting - Publish, print & sell it - Publish
Blogpulse - Search blogs - Search
Blogr - Publish & share your media - Publish
Blogreporter - Submit & rate blog articles - Rate
Blogrovr - Get links to context relevant blog articles while you're browsing - Search
Blogrox - Publish your blog (Wordpress) - Publish
Blogs - Notification2email - Publish
Blogscope - Blog analytics software - Data
Blogsieve - RSS mixer - RSS
Blogsitter - Find (or offer yourself as) a blog co-publisher - Publish
Blogsome - Publish your blog (Wordpress) - Publish
Blogspirit - Blog solution - Publish
Blogster - Free blog & image hosting - Publish
Blogstickr - Add fake stickers to your blog - Fun
Blogstreet - RSS feed directory - RSS
Blogsvertise - Make money on writing articles and reviews on your blog - Economy
Blogtalkradio - Host your own phone-in talkradio show online - Audio
Blogtelevision - Search videos in blogosphere - Video
Blogtoprofit - Make money on writing articles and reviews on your blog - Economy
Blogtronix - Blogging & corporate community software - Community
Blogtv - Live video cast tool - Communicate
Blogyx - Publish your blog - Publish
Bloki - Publish your blog - Publish
Bloodee - Digg horror - Rate
Bloqr - Publish & share blogs & media - Publish
Blosker - Submit & rate strange & naughty news - Rate
Blotter - Graph your blog's popularity - Software
Bloxor - Maintain & use your blogroll online - Publish
Blubbry - Publish, share or listen to pod & vodcasts - Multimedia
Bluechipexpert - Profile yourself, invite friends & recruit other professionals, and get paid - Employment
Bluedot - Social bookmarking - Bookmark
Bluedot (formerly: Blue) - Find & share - Search
Blueform - Design your forms - Office
Bluegrind - Have your personal news anchor reading the news to you - News
Bluegrind - Have your personal news anchor reading the news to you - News
Bluemountainarts - Submit your poems & get paid if they use it for greeting cards - Economy
Bluepuddle - Create & enrich maps - Geo
Bluepulse - Internet 2 cell phone - Software
Blueshoes - PHP app framework, plus CMS - Software
Bluesmiley - Manage your online life - Office
Bluetie - Collaborative Office-like toolkit - Productivity
Blufr - Multi-player trivia knowledge game - Game
Blummy - Manage your bookmarks - Bookmark
Blurb - Turn your blog into a book - Publish
Bmaccess - Social bookmarking with thumbs - Bookmark
Boardreader - Forum & bulletin board search engine - Search
Boardtracker - Search forums - Search
Bofunk - Pick up content for your blog - Multimedia
Bok - Call long distance & international for a few cents (USA & Canada) - Communicate
Bolt - Watch, upload & share media - Store
Boober~ - Get or bid for giving loans - Finance
Boo-box - Add shopping links to your postings & make money on them - Marketing
Bookalesson - Matching service for instructors & students - Employment
Bookmarktracker - Social bookmarking - Bookmark
Bookmooch - Exchange old books - Community
Bookr - Create & share photobook with Flickr images - Images
Bookrevyoo - Social book review community - Community
Booksforschool - Buy & sell used text books - Ecommerce
Bookswellread - Publish & share book reviews - Publish
Boomp3 - Upload & share your music - Audio
Boompa - Show your rides & find guides & parts to improve them - Economy
Bordee - Instantly create message board for your page - Software
Boredwealth - Get paid to surf ("Alladvantage.com resurrected") - Economy
Bottomfeeder - RSS reader (cross platform) - RSS
Bouldr - Share climbing (map mash-up) - Community
Bountee - Design, buy & sell T's - Ecommerce
Box - Store & share data - Store
Boxbe - Use as your public address, let advertisers pay to reach you - Communicate
Boxcloud - Store & send - Store
Boxed* - Build calendars out of all sorts of online sources - Office
Boxstr - Store & share - Store
Boxxet - Personalize your incoming content - Startpage
Bozpage - Web 2.0 sources - About
Braincast - Voicemail2web - Communicate
Brainkeeper - Capture, distribute & collaborate on corporate knowledge - Knowledge
Brainreactions - Participate in brainstorms & share ideas - Knowledge
Brandgossip*~ - Find what people say about your brand - Search
Brands20 - Traditional brands in 2.0 design style - Fun
Bravenet - Publish your blog - Publish
Break - Upload, explore, rate & share comedy videos - Video
Breakinglocals - Local artists and fans community - Audio
Breeze - Email marketing solution - Communicate
Brickfish* - Submit, vote for & review content, and get rewarded for it - Publish
Brightcove - Upload, explore, rate, share & syndicate videos - Video
Brilliantbuttonmaker - Button maker - Design
Bringr - Submit & rate women's special interest articles - Rate
Bringsome - Ask the world to bring you some, or bring something to someone else - Community
Brinkpad - Create, edit & share your presentations - Office
Britepic* - Add extra content & intelligence to your online pics - Images
Britney - Recommend, publish & digg next big hits - Rate
Briz - RSS reader (Windows) - RSS
Broadbandgenie - Find best provider - Ecommerce
Broadbandsports - Upload, explore, rate & share sports videos - Video
Broadramp - Multimedia management solutions - Software
Broadsnatch - Share multimedia - Multimedia
Broken - Tech vidcast - Video
Brokenotbeat - Donate to a needy person each day - Economy
Browse3D - 3D web browser - Browse
Browsershots - Test your site in different browsers - Software
Browsr - Social directory - Startpage
Browster - Search & browse instantly - Search
Browzar - Surf anonymously - Browse
Brusheezy - Photoshop brushes for download - Design
Bryght - Create & maintain a community - Store
Bstir - Serve a random posting from your archive - Publish
Bubble20snarkgroup - Everything against Web 2.0 - About
Bubbleguru - Record & publish your videos (featuring you) - Publish
Bubbleply - Add bubbles to media & share them - Video
Bubbles - Launch frequently used sites in your system tray from a light browser (download) - Browse
Bubbleshare - Phlog, share, add audio captions - Multimedia
Bubblesnaps - Add balloons to your pics & share them - Publish
Bubblr - Create & share photo strips - Publish
Bubblus - Brainstorm together online - Knowledge
Buddymapping - Assemble your friends on a map & publish it - Geo
Buddymarks - Social bookmarking - Bookmark
Buddyping - Find friends & events locally (map mash-up) - Office
Budgetpulse - Manage your budget - Finance
Budgettracker - Track your finances - Finance
Bugja - Bug tracking for ninjas - Software
Bugjuice - Track bugs - for groups - Software
Buildhardlink - Link to physical objects & access data over your cell phone - Geo
Builtsmarter - Modular site (re)construction software - Software
Bulletads - Make some money on accepting ads on your blog or website - Marketing
Bulletin* - Share data & mash them up with geo information - Geo
Bulletprooflinks - Share tutorials, tools & templates - Design
Bullpoo - Find, share & collaborate on investment information - Finance
Bunchball - Play games with your friends - Game
Burstcast - Upload & share photos - Images
Businessitonline - Collaboration tools - Productivity
Business-planet - Submit & rate business news - Rate
Businesssoftware - Article on running a business on Web 2.0-based software - About
Bustaname* - Domain name checker - Search
Busythumbs - Post & share text & photos from cell to blog - Publish
Butlerbob~ - Advertise, find, book & buy concierge services - Ecommerce
Butterfat - Traceroute map mash-up - Communicate
Butterfly~ - Bookmark & annotate - Bookmark
Buttonator - Drag, drop & share web buttons - Design
Buttonbrowser - Button gallery and button maker - Design
Buttonmaker - Create buttons with a few clicks - Design
Buurtlink~ - Find people, places & news in your hood - Community
Buxfer - Keep track of shared costs - Finance
Buyyourfriendadrink - Buy or redeem drinks thru cell phone code - Economy
Buzka - Social bookmarking - Bookmark
Buzzchurch - Community & forum for music makers - Audio
Buzzdash - Create & share polls - Survey
Buzzfeed - Memetracker goes Boingboing - News
Buzzillions - Buy & review products - Ecommerce
Buzzingo - Buzz notifier (Yahoo + Feeling Lucky mash-up) - News
Buzzlogic - Monitor, map, measure & manage your rep in social media - Identity
Buzznet - Share videos & photos - Multimedia
Buzzshout* - Review & rank Web 2.0 companies - About
Buzzvote - Conduct polls - Survey
Buzzwire - Explore, create & share video & audio on your mobile - Multimedia
Buzzword - Work on documents together - Productivity
Buzzwordhell - Rate & condemn - Fun
Byoms - Personalized IM search agents on your cell - Search
Bytemycode - Submit & rate code snippets - Rate

Update 070527, 070831.

Web 2.0 alphabetical: from Cafépress to Ezpublish

Italic = new to this index.

CCC
C4-world - Fight poverty by participating - Community
Cafépress - Design, sell, buy - Ecommerce
Cafespot - Social guide to cafes, restaurants, etc - Marketing
Cakephp - Rapid development framework for PHP - Software
Calc5 - Online calculator - Office
Calcoolate - Online calculator - Office
Calcr - Online calculator - Office
Calendarhub - Create & share calendars - Office
Calgoo - Online & offline calendar - Office
Callthefuture - Place future phone calls - Communicate
Callwave - Voicemail2text (USA) - Communicate
Cambrianhouse** - Collaborate on new software - Community
Camino - Mozilla power & Mac style browser - Browse
Campaignmonitor - Email marketing tool - Marketing
Campfire - Permalinked chat - Communicate
Camraoke - Submit, rate & share karaoke videos - Video
Camtwist - Add sfx to your video chats (Mac) - Communicate
Canvaspainter - Painter - Images
Capazoo* - Create, publish & share your content - Community
Capitoolvertical - Search VCs & entrepreneurs - Finance
Captioner - Add comic-style captions to your images - Images
Carbonite - Back up your PC - Store
Carbonmade - Publish & manage your portfolio online - Ecommerce
Care - Board for babysitting, nannies, child care, tutoring, pet care & senior care - Employment
Care2 - Digg sustainable things - Rate
Careerbuilder - Find jobs yourself or get recommendations - Employment
Cartfly** - Create & exploit a store & embed it anywhere - ecommerce
Cashboard - Track your expenses - Finance
Caspio - Create dbase apps without programming - Data
Caspioe - Organize & manage your data - Data
Castingwords - Podcast2text transcription service - Audio
Castpost - Upload & share multimedia - Multimedia
Catchthebest - Manage job applications - Employment
Catoms* - Replicate anything and anybody, any size, anywhere - Personal manufacturing
Catster - Digg cats - Rate
Causerie - Mobile instant messenger - Communicate
Cchits - Social bookmarking - Bookmark
Ccube - Call anonymously with other community members - Communicate
Ceiva - Host & share photos - Images
Celebpops - Submit & rate celebrity news - Rate
Celebralike - Participate in & vote on celebrity lookalike contests - Images
Celebsafari - Submit your photos of celebrities - Images
Cellcast - Record audio or video with your cell phone & share it with friends - Communicate
Cellitused** - Sell your cell - Ecommerce
Celljournalist - Sell your scoops live - News
Cellsea - Photo editor - Images
Cellswapper - Swap out or in a mobile phone contract - Economy
Celltell - Send voice notes from your phone - Communicate
Celumimagine - Media management tool - Software
Centericq - Instant messenger (client) - Communicate
Centraldesktop - Collaboration tools - Productivity
Cerado - Networking platform for organizations - Community
Certifyr - Certify 2.0-ishness of your website - Fun
Chacha* - Get real time results with help of live guides - Search
Chainreading - List, review & recommend books - List
Chalksite - Bring your classroom online - E-learning
Changedetection - Create RSS from websites - RSS
Changenotes - Create RSS from websites - RSS
Changethis - Share & rate thoughtful, rational, constructive manifestos about important issues - Publish
Changetolink - Create, bookmark & share pages - Bookmark
Changingthepresent - Invite friends to donate to your good causes - Economy
Chartu - Rate music - Audio
Chatcreator* - Create your chat room instantly - Communicate
Chatfu - Cartoonize your chat - Communicate
Chatsum* - Chat with & leave messages same-site-visitors - Communicate
Cherrypy - Object-oriented HTTP framework written in Python - Software
Chicagocrime - Crime dbase map mash-up - Geo
Chickadvisor* - Get & share advise on chicks in your city - Community
Chinswing - Voice message board - Communicate
Chinwagjobs - Post jobs, look for vacancies, get alerts - Employment
Chipin - Connect, collect & give money - Economy
Chitika - Make some money on accepting ads on your blog or website - Marketing
Christonium - Publish & share any content in any way - Publish
Chumby - Always-on wi-fi device to fetch & exchange media & to communicate - Wi-fi
Chuquet* - Find buzzes - Bookmark
Cicatriz* - Video-empowered ecommerce - Ecommerce
Cingo - Keep your family together online - Community
Cingularmusicid - Have music recognized thru your cell - Audio
Circleup - Ask questions, get consolidated group's answer - Knowledge
Citebite - Get a URL to a textbite - Publish
Citeulike - Store, share, manage academic papers - Publish
Citizenbay - Get yourself on the map & meet new friends - Community
Citizendium - Wiki with gentle expert moderation - Productivity
Citycita - Find likeminded people & meet them - Community
Citycribs - Real estate marketplace - Ecommerce
Cityfeeds - Find what's happening in a city now - Search
Citypixel - Claim your space in 3D cities - Marketing
Citytherapy - Share places, events & people - Community
Civilnetizen - File swapping - Office
Cl1pnet - Copy & paste between computers - Software
Claimid - Manage your online identity - Identity
Claimtheearth - Massive mash-up geo game - Game
Classcaster - Interact with students thru podcasts & blogs - E-learning
Classiccat - Free classical mp3 directory - Audio
Clearblogs - Publish your blog - Publish
Clearcheckbook - Track your expenses - Finance
Clearforestsws - Semantictextanalysis2XML - Data
Clearspace - Enterprise collaboration solution - Software
Clearspring - Cross-platform widget development app - Software
Clevercopy - Content management system - Software
Cleversafe - Software for dispersed data storage - Store
Clicdev - Customizable startpage - Startpage
Click2map - Create, manage, publish & share maps - Geo
Click2zap - Remove parts of web page before print out - Software
Clickbank - Make some money on accepting ads on your blog or website - Marketing
Clickbeurs~ - Create your avatar & apply for a job through a chat with your future employer - Employment
Clickcaster - Record, license, publish & promote your radio show - Audio
Clickforlessons - Matching service for instructors & students - Employment
Clickfriends - Upload & share photos - Images
Clicksor - Make some money on accepting text link advertising - Marketing
Clicktale - Analyse blog traffic - Data
Clicktoscan - Scan, store & share documents with your phone camera - Images
Clicktv - Edit & comment on videos while you watch - Video
Clicmobile - Mobile social software - Software
Climber - Profile based job board - Employment
Clipclip - Make & share notes - Office
Clipfire - Shop search engine & community - Ecommerce
Clipmarks - Social clipping - Bookmark
Clipnabber - Helps you to download videos anywhere - Video
Cliproller - Search video & get recommendations - Search
Clipshack - Upload, explore, rate & share videos - Video
Clipsync - Watch videos together & chat - Communicate
Clipsyndicate - Publish video news on your blog - Publish
Clixgalore - Make some money on accepting ads on your blog or website - Marketing
Clockingit - Project management for SME - Productivity
Closo - Start & advertise your online shop - Ecommerce
Cloudalicious - Follow site's tags over time - Tag
Cloudee - Aggregates news per term - Search
Cluckoo - Publish & share local news - News
Cluebacca - Storing & organizing text clips - Publish
Clustrmaps - Map your blog visitors - Geo
Clusty - Cluster results in folders - Search
Cmsmadesimple - Content management system - Software
Coastr - List & share your beers and beer places - Marketing
Cocomment - Track back your commentosphere - Publish
Coda** - One page web development - Software
Codase - Search for & share code - Software
Codefetch - Searches source code from programming books - Software
Codeigniter - Web app framework for PHP - Software
Cofax - Content management system - Software
Cogenz - Intra-company social bookmarking - Software
Coghead - Create & share web-based business apps - Software
Cogmap - Create, edit & share org charts - Productivity
Cogteeth - Create T-shirt with personal coded message - Ecommerce
Coinlogic - Make money on your content - VAS
Colib - Tag, share & sort your media - Multimedia
Collaboradate - Meta dating website - Date
Collaborativerank - Search & rank - Search
Collarity - Customize your search & find people with similar search interests - Search
Collectfavorites - Social bookmarking - Bookmark
Collectik - Upload, manage, mix & share podcasts - Audio
Collectiveintellect - Collect, filter, analyze & trade on financial data - Finance
Collectivex - Communicate, share files & schedules, group-wise - Community
Colligo - Collaboration tools - Productivity
Colorblender - Colour picker & matcher - Design
Colorcell - Find beautiful colour combinations - Design
Colormixers - Create color schemes - Design
Colorschemer - Explore colour schemes - Design
Colorsharewonders - Color scheme generator - Design
Colourlovers - View, are & review colour schemes & trends - Design
Colr* - Play with colour photos & publish results - Images
Colrpickr - Search Flickr photos based on their color - Search
Columbiaredhot - Submit & rate music, DJs - Rate
Comagz - Co-create & rate content - Community
Comapping - Mindmap tool - Productivity
Combots - Communicate & share emoti(c)ons 1 to 1 - Communicate
Comeeko - Create & share photo strips - Publish
Comicvine - Wiki for comic book lovers - Publish
Commentful - Alert service for unbundled content - News
Commissionjunction - Make some money on accepting ads on your blog or website - Marketing
Commongate - Create your own social network - Community
Commontimes - Social bookmarking & clippings - Bookmark
Communicationtube - Meta instant messenger - Communicate
Communitywalk - Share places & routes (map mash-up) - Community
Companymeetcreative - Job board for creatives - Employment
Compete - Get info on sites' traffic, offers and trustworthiness - Search
Competitious - Track & get alerts on your competition - Survey
Complore - Collaborate on research - Knowledge
Comvu - Broadcast video live from your cell - Video
Conceptshare - Collaborate on design - Productivity
Confabb - Search for or publish conferences and their speakers & content - Publish
Confirmeo - Check if your emails are read - Office
Confluence - Enterprise wiki - Publish
Congoo - Search and preview premium content for free - Search
Connectbeam - Intranet community solution - Software
Connectedy - Social bookmarking - Bookmark
Connectingthedots - 2.0 blog - About
Connectmeanywhere - Mobile & landlines over IP - Communicate
Connectviabooks - List, review & discuss books - List
Connotea - Social bookmarking (for researchers) - Bookmark
Conservativematch - Only for rednecks - Date
Considerati - Job board for techies (Europe) - Employment
Constantcontact - Webmail solution - Communicate
Consumating - Tag based dating - Community
Contactify - Create & publish contact form (without revealing your email address) - Software
Contactnetworks - Enterprise relationship management solutions - Software
Contactoffice* - Virtual office (Belgian) - Office
Contactsclinic - Keep your Outlook contact data updated (Client) - Office
Contakme - Upload & share photos - Images
Contentnow - Content management system - Software
Contentvote - Add voting to your blog content - Survey
Contractpal - Manage your contracts - Software
Conversate - Create your own chat - Communicate
Conversivechat - Chat solution - Communicate
Converticon - Convert PNGs or ICOs - Images
Convinceme - Choose from 3 debating features - Communicate
Cooliris - Search within search (client) - Search
Coolworks - Job board for summer and seasonal jobs - Employment
Cooperationcommons - Knowledge base re cooperation & collective action - Knowledge
Cooqy - Find things faster on Ebay (client) - Ecommerce
Copernic - Search app - Search
Copperproject - Manage & collaborate in projects - Productivity
Copyscape - Find out who takes over/plagiarizes or steals your content - VAS
Copythispresentationtricklikeanybodyelsedid - His name is Dick - Identity
Corank - Dig & explore digs from people that matter to you - Rate
Cordance - Dataweb technologies - Software
Coreap - Social bookmarking - Bookmark
Corkd - Catalog, rate & review wine - Community
Coroflot - Job board for for creatives - Employment
Correlate - Profile aggregator - Identity
Corveum - CRM solution - CRM
Cosmopod - Your personal desktop - OS
Cottonrape* - Shopping game - Ecommerce
Couchsurfing* - Home swapping & holiday dating - Economy
Coulltv - View videos & add interactive elements to it - Video
Covenanteyes - Anti-porn filter for… you - Software
Coventi - Collaborate on documents - Productivity
Coverpop - Mash-ups of everything - Ecommerce
Cozi - Organize your family - Productivity
Cozmotv - Create & organize video channels - Video
Cps - Content management system (enterprise) - Software
Crackfeed - RSS reader (Windows) - RSS
Crackle* - Publish & share your video - Video
Craftster - Share crafting ideas - Community
Craigslist* - Post & read classifieds - Ecommerce
Craigslistjobs - Classfied job ads - Employment
Craigsnumber - Get a temporary, anonymous phone number - Communicate
Cramster - Q&A - Knowledge
Crankk - Submit & vote for cycling news - News
Cranky - Search & rate in this age relevant senior search engine - Search
Crashplan - Backup service - Store
Crazoo - Make money on starting new threads and posting in forums - Economy
Crazyegg - Watch users' click paths as a movie - Data
Creamaid - Spread the word thru your blog & get paid - Marketing
Creataplace - Design, build & host simple website - Software
Create-ringtone - Create & send ringtones, wallpapers, videos etc. to your mobile phone - Software
Create-ringtone - Create & send ringtones, wallpapers, videos etc. to your mobile phone - Software
Creatingonline - Design & image editing toolbox - Software
Creativecommons - Manage your digital rights - VAS
Creativemanager - CRM solution - CRM
Creativeprooffice - Organize & manage projects - Productivity
Creative-weblogging - Make money on blogging - Economy
Crickee - Send & receive sms for free - Communicate
Crispads - Make some money on accepting ads on your blog or website - Marketing
Crispynews - Build your own Digg for free - Software
Crisscross - Comment on & add to news - News
Criteo - Review, compare & share films - Video
Criticker - Rate films and get recommendations - Community
Crossloop - Share your screen - Software
Crowdabout* - Get or contribute to timelined comments on podcasts - Audio
Crowdiq - Social delphi; set up your own exchange for futures - Game
Crowdrules - Upload your media, ask questions & get unbiased results - Multimedia
Crowdspirit - Electronics design community (stealth) - Personal manufacturing
Crowdstorm - Add & research products & share opinions - Ecommerce
Crowdsurfer - Publish & share reviews on books, movies & music - Publish
Cruisinaltitude - Submit & rate aviation news - Rate
Crunchboard - Job board for Techchrunch readership - Employment
Cruxy - Sell, promote, buy your content - Multimedia
Cspace - Platform for P2P communications - Software
CSSbeauty - Submit & share well designed websites - Design
Cucumis - Translate or be translated - Economy
Culturecloud* - Research, discuss & share topics, associating randomly with facts and people - Survey
Curbly - Share design & get advise on it - Community
Curious-contraptions - Digg this forum - Rate
Currenttv - Create & upload, watch & vote - Video
Curriki - Publish & share curricula on this wiki - E-learning
Curse - MMOG portal & community - Game
Customerforce - Search & share everything - Community
Customervision - Enterprise wiki - Publish
Customreader - White label RSS reader - Marketing
Cuts - Create, edit, upload & share videos - Video
Cvent - Organize & manage events - Productivity
Cvwarehouse - Job board - Employment
Cyberdummy - Share code - Software
Cyclr - Manage financial obligations - Finance
Cylive - Publish, keep & share all your digital stuff here - Publish
Cynin - Manage, organize, store, search, collaborate, discuss, share & publish any kind of data - Productivity
Cyworld - Record, share & give - Community

DDD
Dabble - Share, manage & explore your information - Community
Dada - Make money on referring friends and driving traffic - Economy
Daddaily - Community for dads - Community
Daem* - Take pics with your phone cam, have them recognized & win prizes - Marketing
Dailylit - Subscribe to books delivered by email, in chunks you define - VAS
Dailymashup - Flickr + Delicious + Yahoo news mash-up - News
Dailymotion - Upload & share videos - Video
Dailyrotation - Share tech websites' headlines - News
Dailyrss - Digg RSS news - Rate
Dailystrength* - Share health challenges & get wellness support - Community
Daisy - Meet & share with fellow site visitors - Communicate
Danbooru - Upload, tag & share images - Images
Dandelife - Describe & share your life - Community
Dapper** - API generator - Software
Darejunkies* - Video challenge contest - Video
Darkeye - Submit, review, rate & share websites - Bookmark
Darmik - Sell & share profits with charities - Ecommerce
Dash - Fast command interface for windows - software
Dash* - Internet-connected navigation system - Geo
Data360 - Find, present & share data - Data
Datamashups - Create mash-ups & apps - Data
Datamining - Reporting on new things with a focus on movies, NLP, blogosphere data & visualizing them - About
Datapreserve - Backup service - Store
Dawanda - Social market place for people producing or buying handicraft (private beta) - Ecommerce
Dayjet - Manage & book your point-to-point air travel - Ecommerce
Daylife* - "4 minute old" news magazine; you can contribute tips & ideas - News
Daylo - Contribute to local yellow pages - Economy
Daypop - Search news - Search
Daytipper - Make money on writing tips - Economy
Daz*~ - Explore, contribute to & share the biggest music dbase - Audio
Dbprism - Content management system - Software
Ddig - Submit & rate special interest articles for developers - Rate
Ddir - Get listed as or book a designer - List
Dead20 - Anti-reviews of Web 2.0 phenomena - About
Deadjournal - Live Journal for pissed off people - Publish
Dealbundle - Rate & share deals - Ecommerce
Dealcomet - Explore, submit & share best deals, offers & coupons - Ecommerce
Dealcritic - Digg offers - Ecommerce
Dealdb - Submit & rate coupons & other promotions - Rate
Dealigg - Submit & rate deals - Rate
Dealmine - Personalize your best deals - Ecommerce
Dealplumber - Find deals & coupons - Ecommerce
Dealsplus - Share hot deals - Ecommerce
Dealspy - Submit & rate deals - Rate
Dealtagger - Find & share good deals - Ecommerce
Decilogratis - Publish and share (lists of) words - Office
Decipho - Clustered search - Search
Deepquerymanager - Search, share & manage info from the deep web - Search
Deepquote - Create links to quotes - Bookmark
Defendmyname - Outsource your personal search engine optimization - Identity
Delexa - Test effectiveness of your website - Data
Delicious* - Social bookmarking - Bookmark
Deligio~ - Discover, manage & share your downloads - Software
Delineate - Ranks top websites with Delicious tags & Alexa data - Data
Delirious - Social bookmarking - Bookmark
Delivr - Upload & share post cards - Images
Democracy - Internet tv platform (client) - Video
Demofuse - Create & share website tours - Publish
Demotd - Submit & rate unknown artists - Rate
Designaddict - Explore & contribute to design directory - Productivity
Designquote - Job search for designers & programmers - Employment
Desktopize - Widgetize your website - Publish
Desktopondemand - Customizable startpage - Startpage
Desktoptwo* - Manage your desktop in a browser - OS
Desnackbar~ - Find the one you want to have a snack with - Date
Deusto - Create & share digital books - Publish
Devbump - Submit & rate special interest articles for game developers - Rate
Developerid - Community for web industry - Community
Deviantart - Publish or buy from art portfolios - Community
Devshop - Software project management software - Productivity
Devshots - Create a Google-like logo - Fun
Dexly (olim Categoriz) - Categorized list of Web 2.0 companies (heavily depending on Everything 2.0) - About
Diarised - Manage your time - Office
Diaryland - Publish & share a web diary (a.k.a. Pitas) - Startpage
Dictionary - Write & share anything - Office
Diffbot - Get alerts on websites' changes - Software
Difm - Radio community - Audio
Digalist - Submit & rate lists - Rate
Digforit - Meta search - Search
Digg* - Mash-up news sources to your own taste - News
Diggdex - Submit & rate Digg-clones - Rate
Diggfiltr - Create custom digg feeds - Rate
Digg-gay - Submit & rate special interest articles for gays - Rate
Digglicious - Mash-up of Digg & Delicious - Bookmark
Diggstack - See diggers fall on active stories - Rate
Diggswarm - See diggers swarm around active stories - Rate
Diggtrends - Digg deeper - Rate
Digitalbycicle - Media distribution solutions - Software
Digitaldreamdoor - Music genre Top lists & trivia - Audio
Digitaljournal - Identify, rank & share interesting news - News
Digitalmagics - Stream your mobile videos over IPTV - Video
Digitalmediasearch - Search media - Search
Digitalpodcast - Search podcasts - Search
Diglog - Diggs Chinese Web 2.0 pages - About
Digstock - Digg stock - Finance
Diigo - Social bookmarking on steroids - Bookmark
Dijjer - Swap your files - Software
Dimdim - Create, edit & share your presentations - Office
Dimewise - Manage your finances - Finance
Dine52 - Social bookmarking - Bookmark
Directbaggage - Luggage delivery service - VAS
Disclosetv - Publish & share conspiracy video stories - Video
Disclosetv - Publish & share conspiracy video stories - Video
Discogs - User-built music database - Audio
Discrevolt - Upload your music & sell printed cards with download redemption codes - Ecommerce
Dishmaker - Designs & produces dishes - Personal manufacturing
Dissectmedicine - Digg articles on medicine - Rate
Ditto - Search images - Search
Diversetrade - European alternative to (higher rates of) Ebay - Ecommerce
Divicast - Add images & text to your podcasts, publish & share - Publish
Divshare - Store & share - Store
Divvycast - Create & share music podcasts - Publish
DIYmap - Create maps in Flash - Geo
Dizzay - Q&A (instant answers through chat) - Knowledge
Django - Python framework for rapid development - Software
Dliveo - Send & track email, any size - Office
Dltv - Video podcasts for tech geeks - Video
Dnaancestryproject - Trace & share your ancestry - Community
Dnastylelab - Design, wear & share your own products - Ecommerce
Dnsstuff* - Get a full technical report on your server status - Software
Docly - Publish, share or sell your documents - Publish
Docstoc - Manage your documents - Software
Docusign - Manage your documents - Software
Dodgeball - Hook in with your mobile & meet friends - Community
Dogear - Social bookmarking - Bookmark
Doggdot (formerly: Diggdot) - Contribute to news magazine and get paid for it - News
Dogster - Digg dogs - Rate
Dojo - Build dynamic features using JavaScript - Software
Dollpalace - Create a doll & share it - Community
Domainsbot - Domain search & suggestions - Search
Domaintools* - Excellent toolset for everything related to domains - Software
Domystuff - Get assistants to bid on your chores & errands, or assist others - Economy
Donorschoose - Donate to schools - Economy
Dontclickit*** - Clickless interface - Design
Dontdatehimgirl - Women community - Community
Dontstayin - Clubber community (UK) - Community
Doodle - Create & publish polls - Survey
Doostang - Community for professionals - Community
Dopetracks - Record, upload & share your tracks and beats - Audio
Dosize - Resize & send your photos - Images
Dotherightthing* - Dig or diss companies - Rate
Dotnetkicks - Digg .net stories - Rate
Dotproject - Open source project management tools - Productivity
Dotsub - Help to subtitle films - Economy
Dottunes - Share your iTunes - Audio
Douban - Catalog, rate, review & share books & music - Multimedia
Doubledate - Pair up with friends - Date
Doubletrust - Google + Yahoo mash-up - Search
Dovetail - High quality video sharing for pros - Video
Downelink - Gay community - Community
Downloadsquad - Reviews Web 2.0 companies - About
Downthisvideo - Search & download videos - Search
Dphoto - Upload & share photos - Images
Dpolls - Create, vote for & search polls - Survey
Dragonflycms - Content management system - Software
Drama20show - News & opinions on Web 20 start-ups - About
Dreamcrowd - Publish & share dreams, and get them explained - Publish
Dreamcrowd - Publish & share dreams, and get them explained - Publish
Dream-recorder - Record YOU while you sleep - Software
Dreamteam - Organize & manage projects - Productivity
Dreamzone* - Create or improve & vote for images - Images
Driveway - Store & send - Store
Dropboks - Store your files - Store
Dropcash - Create & manage online fundraiser - Marketing
Dropsend - Email & store large files - Communicate
Dropshots - Upload & share photos & video - Images
Drupal - Online CMS - Publish
Drweb - Collection of Web 2.0 navigation menus - About
Dsimobile - Start an mvno network - Ecommerce
Dudecheckthisout - Store & share bookmarks, lists with friends - Community
Duggtrends - Meta Digg - Rate
Dumbfind - Search words + tags - Search
Dumpert~ - Explore, upload, share & rate photo, video & audio files - Multimedia
Dumpr - Fun things for Flickr - About
Dumpt - Manage your photos - Images
Dun&Bradstreet - API for D&B credit check - Finance
Duno - Q&A - Knowledge
Dutchpipe~ - Create multi-user environments - Software
Dutydog - Have handymen bid on your home services - Ecommerce
Dutydog - Have handymen bid on your home services - Ecommerce
Dvdidle - Work around DVD region codes & css - Software
Dzone - Digg for developers - Rate
Dzonesnippets - Upload, explore & share code - Software

EEE
E107 - Content management system - Software
E2dolist - Create, manage & share to-do lists - Productivity
Earfeeder - Scan your disk for music, and automatically get feeds on your favourite artists - Audio
Earkive - Explore podcasts on your phone (cell & landline) - Audio
Earthcaller - Call any land number for free - Communicate
Easybib - Bibliography composer - List
Easymessenger - Meta instant messenger with RSS - Communicate
Easyutil - Api for recommendations - Software
Eatmyhamster - Digg for videos, pics & jokes - Rate
Eazyportal - Content management system for communities - Software
Ebase - Web-based community CRM - CRM
Ebay* - Sell, rate & buy; auction - Ecommerce
Ebaywiki - Wiki on things you can buy & sell - Ecommerce
Ebeebo - Matchmaking for jobs & freelance assignments (UK) - Employment
Ebiwrite - Process & share word documents - Office
Eboyweb20poster - Web 2.0 cityscape illustration - About
Ebuddy - Integrates several messengers (formerly E-messenger) - Communicate
Echosign - E-signature automation solution - Software
Echosign - Contract management solution - VAS
E-church - Find, write & share spiritual blogs - Publish
Ecityxista - Buy internet real estate to increase traffic - Marketing
Economie - Interact for a sustainable future - Community
Econsultant - 2.0 list - About
E-days - Organize & manage groups - Productivity
Edgeio - Find classified listings, publish your own - Marketing
Editgrid - Collaborate on spreadsheets - Office
Editme - Host & create websites - Publish
Edoc* - Fashion ecommerce goes alternate reality game - Ecommerce
Edtags - Submit & rate special interest articles on education - Rate
Edublogs - Blog hosting for teachers (Wordpress) - Publish
Education - Q&A - Knowledge
Eefoof - Publish & share media - Multimedia
Efax - Web2fax - Communicate
Effectivebrand - Create your own community toolbar - Software
Eformcreator~ - Form editor - Office
Egnyte - Upload, store & share all your media & docs - Store
Egosurf - Search yourself, get ranking - Search
Egress - Mobile RSS reader - RSS
Eharmony - Dating for not so young people - Date
Ehusbook - Turn Word into Publisher - Office
Ejamming - Write, record or play music together - Audio
E-junkie - Solve & outsource all online sales - Software
Ejury - Make a few bucks per verdict rendered as a mock juror - Economy
Ekklesia360 - CMS for churches - Publish
Ekoss - Semantic search for engineers - Search
Ekudos~ - Digg Dutch news - Rate
Ekudoz - Give & receive kudoz - Community
Elance - Job board for for creatives - Employment
Elephantdrive - Backup service - Store
Elevatorpitch - Upload, read & rate pitches - Economy
Elfurl - Make long url's short - Software
Elfyourself - Xmas greeting featuring You - Publish
Elgg - Open source e-learning software - E-learning
Elisteningpost - Upload & sell your music (for indies) - Audio
Elkhuistekoop~ - Rate & pick your restaurants - Ecommerce
Eloops - Project management solutions - Productivity
Eluta - Search new jobs (Canadian) - Employment
Elxis - Content management system - Software
Emesene - Instant messenger - Communicate
E-messenger~ - Integrates several messengers (relaunched as Ebuddy) - Communicate
Emokoo - Aggregate all your media from other sites here - Publish
Emongoo - Tools & marketplace to sell your property - Ecommerce
Emotionalfootprints~ - Publish & geo-phlog your history - Images
Emoze - Mobile email and PIM data - Office
Empressr - Create, share & store presentations - Office
Emurse* - Create, share & send your permanent resume page in any format - Employment
Emusic - Music download store - Audio
Enablr - Transcribe podcasts, Text2Snailmail… - Audio
Engage - Matchmake for your friends - Date
Engrade - Helps teachers, students parents to connect - E-learning
Enormicom - Branding 2.0 - Fun
Enroll - Submit & rate any news (categorised) - Rate
Ensiting - Share links with friends - Bookmark
Entellium - CRM solution - CRM
Entriq - Make money on your content - VAS
Entropia*** - 3D entertainment & trading community - Game
Eol** - Wiki with a decent interface (EOL = encyclopedia of life) - Publish
Eons - Babyboomers' community - Community
Eonsex - Porn search - Porn
Epassportphoto - Upload, manipulate, download your pass photo - Images
Epictrip - Multimedia travel wiki - Publish
Epointment~ - Schedule meetings online - Office
Eponym - Create & host your blog - Publish
Eqo - Call, text & IM your buddies on your mobile - Communicate
Eroshare - Upload, explore, rate & share photos - Community
Eroshare - Upload, explore, rate & share photos - Community
ES3** - Social military training game - Game
Eskobo - Personal portal - Startpage
Esnips - Store & share audio, video, clippings - Store
ESPgame - Label images in a game - Economy
Esy - Content management system - Software
Etapestry - CRM solution - CRM
Etelos - Try & buy on demand Web 2.0 apps - Software
Ether - Set up your call centre, make money - Economy
Etomite - Manage your website from anywhere - Software
E-tranet - CRM - CRM
Etribes - Publish your blog - Publish
Etsy - Buy & sell handmade things - Ecommerce
Eunifydb - Organize & manage your data - Data
Eurogoalnews - Submit & rate & tag football news - Rate
Eurotopmodel~ - Rate photo models (map mash-up) - Geo
Evenamonkey - Publish, share & discuss ideas - Publish
Eventful - Create & share events - Office
Eventicus - Create & share events - Office
Eventsniper - Mix your event calendar with feeds - Office
Eventstack - Publish, promote & manage events - Office
Eventwax - Organize, publish & manage events - Software
Evernote - Create, organize & find notes (client) - Office
Everybit - Share your media - Multimedia
Everystockphoto - Upload, search, rate & sell photos - Images
Everything20 - Comprehensive list of Web 2.0 companies and websites - About
Everythingweb20search - Web 2.0 search - Search
Everyzing - Digital media merchandising platform (olim Podzinger) - Multimedia
Evideoshare - Create, publish, share & interact - Video
Evnt - Publish & share RL events - Community
Evoca - Create, manage, share & search voice recordings - Communicate
Evoice - Voicemail2web - Communicate
Evoketv - Localized epg (ajax) - Video
Evolvepoint - Create, track or find feeds - RSS
Ewedrive - Store & share - Store
Exalead** - Unified search technology - Search
Examprofessor - Create, publish & share exams - E-learning
Exaroom - Connect to & share files with family & friends - Community
Excio - Geotag your blog & share it - Geo
Exclaimable - Create or grab all media & share them - Publish
Exodus - Instant messenger (Jabber client) - Communicate
Expensestracker - Track your expenses - Finance
Expensr - Track your expenses - Finance
Experienceproject - Share your experience & meet people who understand you - Community
Experticity - Solutions for live agents, on-screen and on-demand - Software
Explode - Aggregate your digital personae & friends - Identity
Exponent - Content management system - Software
Expotv - Videocast reviews & opinions - Video
Expressdigital - Create a shop & sell your photos - Images
Expressionengine - Web publishing system - Publish
Extate - Property search engine (UK & SA) - Search
Extispiciousimages - Delicioustags2Yahooimages - Images
Extispicioustext - Delicious users' tag clouds - Tag
Extortr - Upload scandalous materials, then blackmail - Fun
Extratasty - Publish & share drink recipes - Publish
Eyebeam*** - Bleeding edge R&D - About
Eyejot - Communicate through video messaging - Communicate
Eyeos - Virtual office operating system - OS
Eyesearch - Search results presented in mini thumbs - Search
Eyespot - Create, edit, upload & share videos - Video
Ez2find - Meta search - Search
Ezpublish - Content management system - Software

Update 070527, 070831.

Web 2.0 alphabetical: from Facebook to Izimi

Italic = new to this index.

FFF
Facebook*** - Student communities - Community
Faceparty - Clubber community (UK) - Community
Factbites - Search results in sensible sentences - Search
Factivism - Submit & rate leftish news - Rate
Faketown - Create, buy, sell, trade & share virtual assets - Game
Famesource - Enhance your fame by buying exposure - Identity
Famfamfam - Search icons - Search
Family-to-family - F2F sponsoring of poor American families - Economy
Famiva - Collaborate on your family tree - Community
Famster - Family community - Community
Famundo - Schedule your family & organization - Office
Fannation* - Customize your sports team's content here - Startpage
Fanpop - Share bookmarks & meet fellow fanatics - Community
Faqqly - Trade Q&A, advice, lend things to friends - Economy
Farecast - Get alerts for flight fares at your level - Ecommerce
Fark - Share links & comments to ridiculous news - News
Faroo - Become part of a search infrastructure (client) - Search
Fashmatch - Match your clothes - Ecommerce
Fastap - Design better keypad interfaces for mobile devices - Design
Fastmail - Webmail solution - Communicate
Fastr - Guess game; Flickr mash-up - Game
Fatfingers - Get better deals on Ebay thanks to typos - Ecommerce
Fatpitchfinancials - Submit & rate financial news - Rate
Fauxto - Photo editor - Images
Favmark - Social bookmarking - Bookmark
Favoor - Personal portal - Startpage
Favoriteblogs - Personal blog feed portal - Startpage
Favoritethingz - Create a badge with your favourite things, give it exposure & earn money - Ecommerce
Favoritoo - Social bookmarking - Bookmark
Favorville - People helping people - Economy
Favr~ - Social bookmarking - Bookmark
Fazed - Share cool links - Bookmark
Fbexchange - Ad network for companies publishing apps on Facebook - Marketing
Fckeditor - web-based word processor - Office
Febber~ - Enterprise RSS aggregation solutions - RSS
Fedsifter - Search feeds - Search
Feed2js - RSS javascript generator - RSS
Feed2podcast - RSS2podcast - Audio
Feed43 - Web page & Blog2RSS - RSS
Feedadvisor - Follow your peers' feed recommendations - News
Feedalley - Social bookmarking - Bookmark
Feedamasser - RSS reader (Windows) - RSS
Feedback20 - Engage an audience in a themed conversation - CRM
Feedbeat** - Bookmark videos, create & share internet tv-shows - Video
Feedbite - Share, bundle & syndicate your feeds - RSS
Feedblendr - Blend several feeds into 1 - RSS
Feedblitz - Notification2email - Publish
Feedbucket - Feed reader Web-based - RSS
Feedbuddy - Find new friends with similar feed needs - RSS
Feedburner - Manage your rss & podcast feeds - RSS
Feedbutler - Social feed reader - RSS
Feedbutton - Meta RSS button - RSS
Feedcatch - Manage your feeds - RSS
Feedcollectors - Collects & socializes your feeds - RSS
Feedcombine - RSS mixer - RSS
Feedcraft - Create, manage, deliver & track feeds - RSS
Feedcrier - Get RSS news alerts through your IM - RSS
Feedcycle - Serialize your feeds - RSS
Feeddemon - RSS reader (Windows) - RSS
Feeddigest - Mix, filter & republish or syndicate feeds on your website - RSS
Feed-directory - Filtered feed search - RSS
Feederreader - RSS reader (mobile) - RSS
Feedexpress - RSS reader (Windows) - RSS
Feedeye - Read feeds - RSS
Feedfeeds - RSS reader (Ajax) - RSS
Feedfindings - RSS filter - RSS
Feedfire - HTML2RSS - RSS
Feedforall - RSS script directory - Software
Feedgit - Meta feed search engine - RSS
Feedication - Personal portal - Startpage
Feedicon - Create your feed icon - RSS
Feedicons - RSS button - RSS
Feedity - Web2rss - RSS
Feedjumbler - Generate, mix or splice RSS or Atom feeds into one RSS or Atom feed - RSS
Feedlet - Feed reader - RSS
Feedlinx - Find feeds on any website - RSS
Feedlounge - Feed reader - RSS
Feedmailr - Feed2mail - RSS
Feedmap - Map your blogs - Geo
Feedmarker - Social bookmarking for news - Bookmark
Feedmashr - Search for rss feeds from past & present hottest news & top stories - News
Feedmelinks - Social bookmarking - Bookmark
Feedmeme - Share feed apps - RSS
Feedmyapp - Web 20 index (using this blog's categories & labels) - About
Feedostyle - Personalize your feeds - RSS
Feedpass - Create a landing page for your RSS feeds - RSS
Feedpath - Social feed reader - RSS
Feedpile - Store & share feeds & links - Startpage
Feedping - Submit your feed to major directories - RSS
Feedpublish - Mix your feeds - RSS
Feedraider - Share your mixed feeds - RSS
Feedrinse - Filter your most interesting feeds - RSS
Feedroll - RSS2JS converter - RSS
Feeds20 - Folksonomied feed reader - RSS
Feeds2be - Create feeds from websites that don't have any - RSS
Feeds4all~ - Feed aggregator - RSS
Feedsforme - Search feeds - RSS
Feedshake - RSS mixer - RSS
Feedshark - Submit RSS feed to directories - RSS
Feedshot - Optimize findability of your blog - Search
Feedshow - Feed reader + shares rev with publishers - RSS
Feedsplitter - RSS2HTML2JS newsreader - RSS
Feedster - Search for feeds - Search
Feedsweep - Publish RSS news feeds - RSS
Feedthebull - Submit info and have the community vote on it - Finance
Feedtier - Web page & Blog2RSS - RSS
Feedtv - Feed portal - Startpage
Feedtwister - Process feeds - RSS
Feedvalidator - Feed validator - RSS
Feedvault - Back-up & share OPML - RSS
Feedvertising - Put advertising in your feeds - Marketing
Feedwhip - Track changes on your favourite websites - RSS
Feedxs - Republish your feeds - RSS
Feedxs~ - Create personal feeds (without website), submit thru messenger - RSS
Feedyes - Gives feeds to sites without feeds - RSS
Feedzie - Finds feeds & casts - Search
Feefo - Leave feedback on sellers; forum - Communicate
Feelingbullish - Rate, view & discuss stocks - Community
Fellowforce~* - Help companies to innovate, pitch & get rewards - Economy
Femo - Tag & share memos online - Office
Fetishtowers - Fetishists community - Porn
Ficlets - Write short stories together - Productivity
Filangy - Current search - Search
File123 - Backup service - Store
Fileden - Store & share - Store
Filefactory - Store & send - Store
Filehigh - Upload, store & manage your photos - Images
Fileho - Store & share - Store
Fileindex~ - Real time traffic jam map mash-up - Geo
Filemobile - Store, organize, share & blog your media - Publish
Filenanny - Store & share - Store
Filenice - File browser (client) - Software
Filepanda - Store & share - Store
Filmcrowd - Review & rate films - Video
Filmpjes~ - Upload, rate & share videos - Video
Filtermusic - Hub for hundreds of Internet radio stations - Audio
Financialengines - Personalized financial advice & portfolio management - Finance
Findlaw - Matching lawyers with clients - Employment
Findmeon - Manage your online identities in 1 place - Identity
Findory - Personalize your news - News
Findsounds - Search for sounds - Search
Finetune - Create your own radio feed - Audio
Finsock - web-based sme business software - Software
Fintag - Finds LSE stocks - Search
Fiql - Publish & share playlists - Audio
Fireant - Upload & share multimedia - Multimedia
Firestoker - Enterprise communications & democratization platform - Productivity
Firstgiving - Start your own fundraiser & market it - Economy
Fisz~ - Social bookmarking - Bookmark
Fivelimes - Green shop aggregator - Ecommerce
Fiveruns - Monitor & maintain your systems - Software
Fixya - Social helpdesk - CRM
Fjax - Cross-browser XML parsing and handling - Software
Flagr - Bookmark the real world - Geo
Flagrantdisregardslideshow - Slideshow of Web 2.0 pages - About
Flappr - Search pictures; Flickr mash-up - Images
Flashdevelopercenter - Downloads, samples, quick starts & community - Software
Flashdevs - Submit & rate special interest articles for developers - Rate
Flashearth - Global maps mash-up in flash - Geo
Flashface* - Compose your Most Wanted portrait - Images
Flashpaint - Draw & share pictures - Design
Flashvillage - Free flash templates - Software
Fleck - Annotate web pages (& share your notes thru email) - Office
Flektor - Mash-up & publish your media - Publish
Flexdirectory - List people, groups, jobs - Data
Flexlists~ - Create & share lists - List
Flexpetz - Share a dog for a few hours or days - Economy
Flickr* - Manage & share your photos - Images
Flickrball - Scavenger-hunt game using Flickr thumbnails and tags for clues - Game
Flickrfling - RSS feeds & Flickr mash-up - Images
Flickrfotofinder - Find & publish photos - Images
Flickrgraph - Visualize relationships inside Flickr - Community
Flickrgraph** - Visualize your network on Flickr - Data
Flickrleech - Fast search for Flickr photos - Images
Flickrlicious - Share babes on Flickr - Images
Flickrlogomakr - Make Flickr-like logo in a second - Design
Flickrmap - Map Flickr photos - Geo
Flickr-storm - Fuzzy search engine for Flickr photos - Search
Flickrsudoku - Sudoku game based on Flickr images - Game
Flickrvision - Flickr updates from various users on Google Map - Geo
Flightaware - Maps planes that are currently in the air - Geo
Flikzor - Profile yourself in a video & publish it anywhere - Video
Flingr - Connect with people you've ever met - Community
Flipadisc - Trade media - Ecommerce
Flippid - Post what you need, and get an offer - Ecommerce
Flipskipper - Personal feed aggregator - News
Fliptrack - Put your photos to music & share it as a video - Video
Fliqz - Share your video collection - Video
Flirtomatic - Flirt & date - Date
Flitic - Manage, tag & find feeds - RSS
Flixn - Record & publish video messages - Communicate
Flixster - Discover & share movies with friends - Video
Flixya - Upload & share videos + revenues - Video
Floorplanner~ - Design your floorplan online - Software
Flotones - Upload & sell indie music over mobile - Audio
Flowcatch - Track your expenses - Finance
Flowchart* - Create & share flowcharts - Office
Flowermaker - Design flowers - Design
Flowser - Visual Amazon search - Search
Fluctu8 - Create & share your sourcelists - Audio
Flukiest - Publish & share videos & photos - Multimedia
Flurl - Submit & rate videos - Video
Flurry - Get your email & more on your current phone - Communicate
Flurrymail - Your email on your current mobile phone - Communicate
Fluther - Q&A - Knowledge
Flux-cms - Content management system - Software
Fluxiom - Capture, manage, access & deliver content - Multimedia
Flyingcart - Set up an online shop - Software
Flyinside - Create, publish & share virtual photo tours - Images
Flypicture - Store & share - Store
Flyr - Search Flickr for geotagged photos - Geo
Flyspy - Graph all of your choices in air travel - Ecommerce
Foafproject - Contribute to web of machine-readable pages describing people & their networks - Identity
Focuspointe - Make money on participating in focus groups - Economy
Fold - Personal portal (stopped) - Startpage
Foldera - Organize email, im’s, docs, tasks, and events instantly - Productivity
Foldershare - Store, access & share files - Store
Folionow - Design, build & host simple website - Software
Folkd - Social bookmarking for news - Bookmark
Fon*** - Share, buy, sell wi-fi connections - Wi-fi
Fonttester - Compare fonts side by side online - Design
Foonance - Manage your finance - Finance
Foonz - Make group calls for free (USA) - Communicate
Fooooo - Search +20M videos - Search
Foopad - Create your own wiki - Publish
Footnote* - Publish & share your history, research, diaries, stories...anything - Publish
Foresightexchange - Bet on your predictions - Gamble
Forex-affiliate - Make some money on accepting ads on your blog or website - Marketing
Forlater - Send email reminders to yourself & others - Communicate
Formassembly - Design your forms - Office
Formassembly - Create, host & manage forms - Office
Formatpixel* - Design, publish & share in any format - Publish
Formdesk - Design your forms - Office
Formlogix - Create forms online - Office
Formspring - Create & publish forms & surveys - Software
Fortuitos - Make friends by accident - Community
Forumboosting - Make money on posting in forums - Economy
Forummatrix - Compare forum software - About
Fotki - Upload, publish & print photo(book)s on demand - Publish
Fotochatter - Publish & share photo on web & cell - Images
Fotocodex - Collaboratively collect, publish & share group photos - Images
Fotoflix - Upload & share photos - Images
Fotogopo - Animated local route map; Google Maps & Geocoder mash-up - Ecommerce
Fotolia* - Buy & sell images - Images
Fotolog - Create & map your phlog - Publish
Fotologue* - Publish & share photos (beautiful Ajax interface) - Images
Fotoloop - Create photo loops & share them on your website - Images
Fotowoosh - Extract 3D image from 2D pictures (stealth) - Images
Foxcloud - Social bookmarking - Bookmark
Foxway - Track your budget - Finance
Fractionallife* - Co-own a/o co-use nice things - Economy
Framer - Add a frame to your photos - Images
Framer - Add a frame to your photos - Images
Franchisegator - Ajaxified franchise search & match - Search
Frankenfeed - Aggregate your feeds - News
Frappr - Put your group on the map, share photos - Community
Free411 - Listen to ads & get free directory guide service - VAS
Freebase - Organize & manage your data - Data
Freeconferencecall* - Organize conf calls for free (USA terminated) - Communicate
Freecrm - CRM solution - CRM
Freedigits - Stay anonymous with this VoiP service (USA) - Communicate
Freefilehosting - Store & share - Store
Freeimagehosting - Upload, store & manage your photos - Images
Freelanceauction - Pitch for a design job - Design
Freelanceportfolios - Submit your portfolio & get assignments - Images
Freelink - Social bookmarking - Bookmark
Freeonlinecalenderpdf - Calendar2PDF - Office
Freep~ - Profile yourself as a freelancer & score gigs - Employment
Freepledge - Support charities every time you shop - Economy
Freepository - Collaborate on coding - Productivity
Freerange - RSS reader (mobile) - RSS
Free-rss - RSS creator, editor, publisher, validator & viewer - RSS
Freetube - Free tv over ip - Video
Freevlog - Set up free video blog - Publish
Freewebs - Create free website, share, sell - Software
Freeyourid* - Open ID + .name + your domain = FreeyourID - Identity
Frengo - Mobile entertainment & communications community - Community
Frenzoo - Dress up your avatar, then chat - Communicate
Freshbooks - Online invoicing and time tracking service - Finance
Freshwebjobs - Job board for web developers - Employment
Frevvo - Design your forms - Office
Friendping - Share map, media & bookmarks with friends - Community
Friendsabroad - Meet & communicate with people globally - Community
Friendster - Connect with friends - Community
Fring - Call for free on your 3G cell - Communicate
Fritterware - Submit & rate games - Rate
Frog - Mobile startpage - Startpage
Froogle* - Local shopping search engine; Google Maps mash-up - Ecommerce
Frucall - Mobile price comparison - Ecommerce
Frühstückstreff - Meet people for breakfast - Community
Fruitcast - Podcast advertising network - Marketing
Frylance - Promote yourself as a freelancer or find one (French) - Employment
Fuckweb2 - Tagged manifesto to shut up about Web 2.0 - Fun
Funadvice - Q&A - Knowledge
Funambol - Mobile OS project - Software
Funda~ - Real estate locations mash-up (nice maps, nice zoom!) - Geo
Fundable - Pledge for funding - Economy
Fundanemt - Content management system - Software
Fundooweb - Meta search - Search
Fungow - Social bookmarking - Bookmark
Funkplayer - Create, upload & share music - Audio
Funkycall - Record, upload, deploy & share your phone pranks - Communicate
Funnydigg - Submit & rate funny videos - Rate
Funnylee - Submit & rate funny stuff - Rate
Funnyordie - Help decide if these videos are funny - Video
Funtigo - Upload & share photos, add music & balloons - Images
Furl - Clip, store & share web pages - Bookmark
Fuser - Fuse all email and social media messages in 1 page - Office
Futef - Clustered search on Wikipedia - Search
Futureme - Remind yourself by future email - Office
Fuvoo - Submit, explore, share & digg videos - Video
Fuzz - Upload & share or sell your music (for indies) - Audio
Fuzzmail - Record & send 'film' of how you generate an email message - Communicate
Fuzzster - Meet pets & their owners - Community
Fuzzylime - Content management system - Software
Fwditon - Rank & read blog articles - Rate
Fwicki - RSS reader (web based) - RSS
Fybersearch - Web and feed search - Search
Fyuze - Feed portal - Startpage

GGG
Gabbly - Get chat on your blog - Communicate
Gabbr - Share news - News
Gabcast - Record podcasts on your phone - Audio
Gabinetedeinformatica - Reviews Web 2.0 sites (Spanish) - About
Gabmail* - Record & send videomail - Communicate
Gaboogie - Organize & manage web conferences - Communicate
Gadabe* - RSS metasearch (relaunched as Tagjag) - Search
Gahooyoogle - Google + Yahoo mash-up - Search
Gaia - Play games & make friends - Game
Gajim - Instant messenger (XMPP client) - Communicate
Galaxiki - Co-create, maintain and own a universe - Game
Gamediggity - Submit & rate game videos (olim Gamelemons) - Rate
Gamegum - Submit your flash game & make some money on it - Ecommerce
Gameklip - Record & share your best gaming moves & tricks - Video
Gamerankings - Vote for & rank games - Game
Gamervision - Publish & share profiles, news & blogs on gaming - Community
Gamesnips - Submit & rate articles on gaming - Rate
Gapminder** - Visualise Google search statistics - About
Garbagescout - Find treasures on NY streets; Google Maps mash-up - Ecommerce
Garlik - Find & track private data online (UK only) - Identity
Gastus - Control your expenses - Finance
Gather - Share passions & get paid - Economy
Gazzag - Post & share photos, find friends - Images
Gcast - Podcasting tools & hosting - Audio
Gchart - Check local time globally - Geo
Gdisk - Hosting thru Gmail - Store
Gearon - Social mobile network around your cellphone's contacts (stealth) - Community
Geek2geek - Find your geek match - Community
Geeklog - Create blogs - Publish
Geesee - Provide chat services, or participate in chats - Community
Geevee - Upload, explore, rate & share game videos - Video
Genbeta* - 2.0 blog (Spanish) - About
Geni - Create & share your family tree, in Ajax - Community
Genielab - Explore, recommend & rate music - Audio
Gennit - Generates code - Software
Genwi - Upload, share & promote all your media - Multimedia
Geobeats - Produce, publish & share tourist videos - Video
Geofeed - Create geography-aware feeds - RSS
Geotagit - Upload & share geotagged collections - Geo
Geotool - Map yourself - Geo
Geotracingcom~ - Share the geo-located photos you've made during a trip & your (animated!) route (and more…!) - Geo
Geotract - Share places & people - Community
Geourl - Location 2 URL directory - Search
Geovector*** - LBS services with a usable interface. - Geo
Getabuz - Create a voice mail with music - Communicate
Getafirstlife - Parallel version of Second Life - Fun
Getafreelancer - Matching freelancers with clients - Employment
Getboo - Social bookmarking - Bookmark
Getdemocracy - Watch or make tv - Video
Getmyvcard - Share your vCard anywhere - Office
Gettalink - Search & get visual links - Search
Getthemlaid - Post your friends' pictures & give them some action - Fun
Gettomas - Online artist management tool - Software
Ghost - Operating System - OS
Ghostzilla - Browse the web within other apps - Browse
Gibbity - Digg games - Rate
Gibeo - Share web annotations & content - Knowledge
Giftbox - List & manage gifts - List
Gifthat - Publish & share wishlists - List
Giftornot - Get ideas for gifts (Amazon mash-up) - List
Gifttagging - Create, tag & share gift lists - List
Giga* - Watch all kinds of live stream & vod shows (German) - Video
Gigadial - Create your podcastradio stations - Audio
Gigasize - Upload & share files - Store
Giggedup - Video resume-based job board - Employment
Gigoit - Reuse, donate or receive 2nd hand goods in your community - Economy
Gigya - Myspace2email - Communicate
Givealink - Donate & share bookmarks - Bookmark
Givebobadollar - Begging - Economy
Givemeaning - Give or take fundraising community - Economy
Givezilla - Create fundraising storefront - Economy
Gixo - Personal portal - Startpage
Gizmo - Call Gizmo friends for free, or pay low rates - Communicate
Gizmocall - Browser-based voip - Communicate
Gizmoojo - Geek community - Community
Gizmoz* - Create your 3D video avatar & use it anywhere - Identity
Glance - Share your screen (7 day free trial) - Multimedia
Glee - Community for gays & lesbians - Community
Glendor - Find & locate jobs (map mash-up) - Employment
Glide - Organize meetings & review projects - Productivity
Gliffy - Mindmap tool - Productivity
Glimpse* - Buy things that celebs wear - Ecommerce
Glinkr - Map & share views on issues - Productivity
Globalfreeloaders - Get & provide accommodation - Economy
Globalideasbank - Submit & share ideas to improve society - Economy
Globalvoices - Tagged aggregator of regional information from particapatory media - Productivity
Globeassistant~ - Get your content mashed up with Google Earth - Geo
Globeblogr - Publish & share your favourite places - Publish
Glue - Publish & share your website's content on mobile devices - Publish
Glypho - Collaborate on writing - Productivity
Gmail - Webmail service - Communicate
Gmworldwar - Risk-like MMO on maps mash-up - Game
GNF - Building tools & services for your resume - Employment
Gnomz - Create & share blogs & comics (French) - Publish
Gnoos - Blog search - Search
Gnosh - Meta search - Search
Gnowsis - Semantic desktop - Search
Gnumeric - Spreadsheet online - Office
Go2web20 - Web 2.0 logo wall - About
Gobby - Edit texts together - Office
Gobignetwork - Community of startup companies - Community
Godaddy - Backup service - Store
Godtube - Upload, explore & share Him - Video
Goffice - web-based word processing - Office
Gofreelance - Matching homeworkers with clients - Employment
Goggles* - Flight simulator's map mash-up - Game
Gogofrog* - Create & share your 3D web page - Design
Gogooroo - User-generated guide to online tv & videos - Video
Goim - Instant messenger (for players of DirectX games) - Communicate
Goingon - Always on network of networks - Community
Gojobby - Publish your resume & blog - Employment
Gokita* - Clustered meta search (no advertising) - Search
Goobtoob - for video clips - Rate
Good - Global mobile messaging for the enterprise - Communicate
Goodnotes - Bookmark, leave notes at & categorize web pages - Knowledge
Goodreads - List, review & recommend books - Community
Goodsearch - 50% of ad revenues for a charity designated by you - Search
Goodstorm - Resell stuff thru your blog - Ecommerce
Googdesk - Meta search - Search
Google* - Search & adwords - Search
Google411 - Voice rec-based search - Search
Googleaccounts - Account authentication API - Identity
Googleanalytics - Folksonomied visitor stats - Data
Googleanswers - Get your questions answered for money - Economy
Googleapps - Offer email, IM and calendar tools to your site's visitors - Software
Googleblogsearch - Search blogs - Search
Googlebooks - Publish & sell access to your? books - Ecommerce
Googlebrins - Create & share your Sergey Brin - Fun
Googlecalendar - Create & share events - Office
Googlecheckout - Multi channel PSP technology & services - VAS
Googlecloud - Add your search terms to these clouds - Tag
Googlecodesearch - Search code - Software
Googlecoop - Share knowledge on line - Knowledge
Googlecustomesearch - Create your own vertical search with Google - Search
Googledocs - Collaborate on documents - Productivity
Googleearth* - Global maps - Geo
Googlefight* - Compare search results - Game
Googleig* - Personal portal - Startpage
Googleimages - Search images - Search
Googlekicks - Digg Google news - Rate
Googlemaps - Check local things globally - Geo
Googlemark - Register your words - VAS
Googlemars - Own a red planet - Geo
Googlemashupeditor - Create mash-ups with Google & external feeds - Software
Googlemobile - Search, email & rss reader - Search
Googlemodules - Lists modules for personal Google homepage - Startpage
Googlenotebook - Compile & share notes online - Office
Googlereader - RSS reader (web based) - RSS
Googlerelatedlinks - Related links service for your web page - Search
Googleromance - Find your soulmates - Fun
Googlesurvey - Make money on giving feedback to Google - Economy
Googletalk - Instant messenger - Communicate
Googletoolbar - Social search - Search
Googletrends - Site analytics software - Data
Googlevideo - Upload, share, purchase videos - Video
Goombah - Analyse & match your musical taste to other users' (client) - Audio
Gootodo - Online to-do service - Productivity
Goovite - Invite people - Office
Goowy* - Personal portal (desktop & browser versions) - Startpage
Goplan - Organize your work & publications - Productivity
Gorb - Dig people anonymously - Rate
Gossip - Instant messenger (Gnome client) - Communicate
Gotalkmobile - Mobile instant messenger - Communicate
Gotapi - Searchable database of APIs - Software
Gotlah - Submit, up or down articles - Rate
Gottabet* - Bet on anything with friends or colleagues - for money or glory - Gamble
Gottaflirt - Flirt game - Date
Gotuit - Watch, list & share videos - Video
Gotvoice - Save & share your voice mail in email - Communicate
Gotzapp - Publish & share content thru your mobile - Community
Gpokr - Play poker & contribute to concept (see Idea-page!) - Gamble
Graball - Meta search - Search
Grabbit - Play songs from all over the web - Audio
Gradefix - Organize your homework - E-learning
Gradr - Rank, research & discuss stocks - Finance
Grails - Open source web app framework for Groovy - Software
Grandcentral* - Get 1 phone number for all your calls - Communicate
Graphita - Edit your photos - Images
Gratuittous - Social wishlist - List
Gravatar - Your globally recognized avatar - Identity
Gravee - Searches sites & blogs; fair rev share on ads - Search
Gravityzoo~*** - The Grid! - OS
Grazr - Compile your own RSS widget - RSS
Greatboyfriends - Post & match your brother's or sister's profile - Date
Greatflickrtools - Extensive list of Flickr apps & mash-ups - About
Greatnews - RSS reader (Windows) - RSS
Greedyme - List & share your wishes - List
Greendoc - Process & share word documents - Office
Greenleafmarket* - Buy or sell local products - Ecommerce
Greentv - Environment focused video channel - Video
Gregarius - Feed reader - RSS
Grepr - Explore & share podcasts & get recommendations - Audio
Gridwell - Search; results with icons - Search
Gritwire - Personal portal - Startpage
Grockit - Online exam preparation - E-learning
Grokker - Enterprise search & knowledge management - Knowledge
Grokthis - Application hosting - Store
Groopus - Visualize your social context based on tags - Tag
Grootbedrijf~ - Merge your company virtually with "Big Company" - Economy
Groovid - Explore & share videos from all over the web - Video
Groovr - Text to & network with friends - Community
Grouper - Upload, create & share media - Multimedia
Grouploop - Organize & collaborate in your own group - Productivity
Groupr - Groups photos from Flickr groups - Images
Groups - Create groups & share content - Community
Groupsharp - Share data, files & wikis - Productivity
Grouptivity - Reduce response on group email - Communicate
Growl - Semantic knowledge management - Knowledge
Grupthink - Explore & share topics & opinions - Knowledge
Gruuve - Discover & listen to music similar to your taste - Audio
Gruvr - Collaborate on local music maps - Geo
Gstock - Volunteer to participate in supercomputing for stocks - Finance
Gtalkr - Google Talk, Flickr, YouTube, feeds - Communicate
Guba - Upload & share videos - Video
Gubb - Make, manage & share lists - List
Guess-the-google - Guess game; Google mash-up - Game
Guicookies - Social bookmarking - Bookmark
Guildcafe - Share your MMORPG history & play - Game
Gumiyo* - Post supply & demand ads & connect live with buyers & sellers through web or phone - Marketing
Gumshoo - Auction analyzer; Ebay mash-up - Ecommerce
Gunzonline - Shoot, stab, run & jump - Game
Guru - Marketplace for freelancers - Employment
Gurulib - Organize, review & share your media - List
Guruza - Ask, or answer questions & get paid - Knowledge
Gusto - Share trips with friends & family - Community
Gutenkarte - Maps spatial components of classic literature - Geo
Gvisit - Map your site visitors - Geo
HHH
H2O - List & share readings on topics - List
Hackoff*** - Book published as blog & podcast - Multimedia
Hahahollywood - Submit & rate celebrity news - Rate
Haiku - Open source OS - OS
Haikuls - E-learning publishing & management solution - E-learning
Hakia - Meaningful results - Search
Hamsterster - Community for hamster lovers - Community
Hanzoweb - Bookmark, tag & share knowledge online - Knowledge
Happyfish - RSS reader (Windows) - RSS
Happyobs~ - Share your personality & get matched to job opportunities - Employment
Harvest - Timesheets & reports - Productivity
Hashbush - Meet your friends' friends - Community
Hassleme - Remind yourself of everything - Office
Hawkee - Tagged price comparison - Ecommerce
Haystack - Music community - Audio
Headmobile - Mobile job board matching service - Employment
Healia - Health search engine - Search
Healthline - Contextual search for health information - Search
Healthmap - Global disease outbreak map - Geo
Heatseek - Browse porn more efficiently - Porn
Hedgestreet - Bet on all kinds of economical parameters - Gamble
Heeii~ - Get context relevant suggestions for further reading while you browse - Browse
Helenos - Semantic knowledge discovery - Knowledge
Helipad - Web note pad - Office
Helium - Buy, sell & trade knowledge - Knowledge
Hellodeo - Record & publish video messages - Video
Hellodeo* - Record & send your video message - Communicate
Hellup~ - Q&A - Knowledge
Helma - Open source Java web app framework - Software
Help2go - Free computer help community - Software
Helperoo - Email support system - CRM
Helpfulvideo - Share your knowledge via video clips - Video
Heyamigo - Matches advertisers up with newsletters - Marketing
Heycast - Publish vod casts - Publish
Heycosmo - Video cast tool - Video
Heysan - Mobile instant messenger (web based) - Communicate
Heywatch - Encode your video in any format - Software
Hi5 - Connect & share ideas with friends - Community
Hictu - See thru which channels you can best communicate with your contacts - Communicate
Hiddennetwork - Job board distributed thru blogs - Employment
Hiddennetwork ~? - Post your job & get matched to people who don't even seek for a job - Employment
Highfivez - Blogosphere search engine - Search
Highrisehq - Online contact manager - CRM
Highvibeit - Submit & rate positive news - Rate
Hinale - Chat with people who have visited the same sites - Communicate
Hipcal - Manage & share calendar & to do lists - Office
Hipcast - Record & cast audio via browser or phone - Audio
Hippo~ - Open source cms - Software
Hirevue - Online video job interviews - Employment
Hiringthings - Hiring & renting market place (new Zealand) - Ecommerce
Hitask* - Organize & manage groups - Productivity
Hitchhikr* - Share knowledge & experiences on conferences - Knowledge
Hitchsters - Share an airport cab - Economy
Hittail - Search optimization software - Marketing
Hivegroup - Treemap specialist - Data
Hivelive - Post & share information - Knowledge
Hiveminder - Publish & share tasks - Productivity
HivePM - Treemap for product management - Data
HivePPM - Treemap for purchasing performance management - Data
HiveSM - Treemap for sales management - Data
Hngry - Rate & pick your restaurants - Ecommerce
Hobeez - Find & make friends people with similar hobbies - Community
Hobnobster - Web and mobile community & social bookmarking - Date
Hobo - Rails extension package - Software
Hodgepodge - Share ideas, tips & opinions on gambling - Gamble
Hollywoodlowdown - Submit & rate Hollywood news - Rate
Holotof - Pitch your ad project among creatives - Community
Homeequityshare - Find investors for your mortgage downpayment - Finance
Homeforexchange~ - Exchange for vacation homes - Economy
Homeportals - Mix, modify & share your web pages - Software
Homethinking - Search, find, contact & review realtors - Ecommerce
Homomojo - Submit & rate special interest articles for gays - Rate
Honestyfirst - Dating for honest people - Date
Honeycomnewsmap* - News treemap - Data
Honeypitch* - Proposal automation solution - CRM
Hoovers - Manage & connect to your personal & corporate networks - Community
Horde - PHP general-purpose web app framework - Software
Hospitalityclub - Get & provide accommodation - Economy
Hotdaddy* - Search engine aggregator - Search
Hotelworldmap~ - Find a hotel (map mash-up) - Geo
Hotmail - Webmail solution (now: Windows Live Hotmail) - Communicate
Hotornot - Geo dating (map mash-up) - Date
Hotornotdesigns - Vote for or against website designs - Images
Hotpads - Houses for rent - Ecommerce
Hotsoup - Community for political debate - Community
Hotspotr - Wi-fi café hotspot map mash-up (USA) - Wi-fi
Hotspots - Network for urban professionals - Community
Hotspottin - Share your favourite hotspots - Community
Hotswap - Video-supported supply & demand - ecommerce
Hotxt - Skype for sms - Communicate
Housingmaps - Find housing (map mash-up) - Geo
Hoverspot - Publish & share your profile - Community
Howmuchisyourblogworth - Compute your blog's worth - Fun
Howsmynanny - Police your nannies together - Productivity
Hrsalad - Submit & rate articles on hrm - Rate
Html2pdf - Render any web page to pdf - Software
Hubdog - Create your news channels online & on your pda - News
Hubpages - Share your genius - Knowledge
Huckuback - Meta search - Search
Huddle - Collaborate on PR, advertising, marketing, design - Productivity
Hugg - Digg on environmental matters - News
Hula - Manage calendars & email - Store
Hullo* - Integrates soft, cell & landline phones - Communicate
Humanizedreader - Feed aggregator with decent design - RSS
Humanpages - Add, share & sell your profile - Economy
Humblevoice* - Publish, share bands, music, other media & arts - Community
Hunuh - Digg green technologies - Rate
Hypediss* - Hype or diss stories - Rate
Hype-list - Get the celeb news of the last 24 hours - News
Hypercomics - Create, explore & share comics - Publish
Hyperlinkomatic - Social bookmarking - Bookmark
Hyperoffice - Manage your contacts - Office
Hypersuper - Personalize your news - News
Hypetracker - Popular news searches in graphs - News
Hyves~ - Share your profile in hyves & meet friends - Community

III
I2drive - Store & share - Store
I4giveu - Confess, share & forgive - Community
Iamsearched - Are you googled-notification service - Search
Iaudioguide - Download audio tours of your favorite cities - Audio
Ibackup - Backup service - Store
Ibegin - Local search - Search
Ibetx - Betting exchange - Gamble
Ibloks - Mix, share, play your media - Multimedia
Ibridge - Aggregates early stage research & technologies - Knowledge
Icalshare - Create, share & manage your schedule - Office
Icebergondemand - Build, share & sell web applications - Software
Icebreaker - Mobile community software - Software
Icebrrg - Build & publish forms online - Office
Iceflake - Aggregate your friends' digital personae - Identity
Icerocket - Search blogs & web - Search
Ichat - Instant messenger (client, Mac) - Communicate
Icio - Social bookmarking & rating - Bookmark
Iconbuffet - Search icons - Search
Iconfactory - Create or search icons - Design
Iconfinder - Icon search engine - Search
ICQ - Instant messenger - Communicate
Icq2go - Instant messenger (web based) - Communicate
ICQphone - Call at low rates - Communicate
Idea-a-day - Submit an idea, get comments & a publication - Productivity
Ideawhip - Community for students, alumni, start-ups - Community
Ideawicket - Community for start-ups & innovators - Community
Identifyus - Identify melodies - Audio
Identitysweep - Manage & protect your identity (USA) - Identity
Idigdeals - Digg deals - Rate
Idigporn - Digg porn - Rate
Idio - Create your profile & get a personalized magazine - Publish
IEM - Futures markets dependable on real events - Gamble
Ifeedreaders - Meta linkpage to RSS & bookmarking services - RSS
Ifilm - Publish, share & explore videos - Video
Ifolder - Filesharing for groups - Productivity
Ifreebusy - Publish & share your calendar - Office
Igamingcms - Content management system for gaming websites - Software
Igglo - Get buy alerts for houses that aren't for sale yet (Finnish) - Ecommerce
Iglance - Push-to-talk videoconf and screen-sharing - Communicate
Ignoreme - Meta brand - Marketing
Ihipo~ - Find international jobs & internships - Employment
Iiproperty - Manage your properties - Software
Ijamr - Music community for artists, fans & site owners (& P2P swapping) - Audio
Ijigg - Submit, digg & share music - Audio
Ijot - Write, manage, publish share text files - Office
Ikarma - Document & promote your reputation - Community
Ikeepbookmarks - Social bookmarking - Bookmark
I-know-where-you’ve-been - Reads out your last visited websites (thru Firefox) - Fun
Ilike - Social music discovery service - Audio
Iliketototallyloveit - Digg the things you love - Rate
Illhostit - Host your images - Images
Illumio - Q&A - Knowledge
Iloggo - Create your logo start page - Startpage
Ilovefreewifi - Contribute to dbase of free wi-fi hotspots in USA - Wi-fi
Iloveim - Meta IM - Communicate
Ilovejackdaniels - Check text readability - Office
Ilovemusicvideo - Youtube & Lastfm mash-up - Multimedia
Ilovemynanny - Nanny jobs & support - Employment
Ilovetocomplain - Publish, share & rate complaints ("5 degrees outside and we have to worry about global warming") - Publish
Ilovetravelstories - Publish or bookmark & rank travel stories - Publish
IM+ - Mobile instant messenger - Communicate
Imagecatalog - Submit & sell your photos - Images
Imagecross - Upload, store & manage your photos - Images
Imageeditor - Edit your images online - Images
Imagegravy - Host & sell images - Images
Imagehosting - Upload, store & manage your photos - Store
Imagekind - Start your own art gallery online - Ecommerce
Imageloop**Create & share photo slide shows (and other animations) - Images
Imagemosaicgenerator - Convert image to photo mosaic - Images
Images - Create & share your own phlog - Publish
Imageshack - Upload, store & manage your photos - Images
Imagevenue - Upload, store & manage your photos - Images
Imaginationcubed - Draw together - Images
Imagini* - Profile yourself with images & find people with similar visual DNA - Community
Imakemistakes - Read, rate & share funniest email fwds - Rate
Imbee - Secure networking & blogging for kids - Community
Imeem - Share words, files & people (on messenger) - Communicate
Imeep - Chat 1 to 1 at random - Communicate
Imemorybook - Publish & print your memories - Publish
Imgplace - Upload, store & manage your photos - Images
Imgppl - Submit & rate images - Rate
Imgseek - Tag, rate & retrieve images - Images
Imhaha - Meta instant messenger - Communicate
Imity - Sense phones (and friends) around you thru Bluetooth - Community
Immediat - Messenger notifications of feeds - RSS
Imo - Instant messenger - Communicate
Impersonals - Date without being creepy - Date
Impetuous - Store & share porn bookmarks - Porn
Imthere - Share where your are & where you're going - Communicate
Imunitive - Instant messenger - Communicate
Imvu - 3D messenger - Communicate
Inblogads - Make money on writing articles and reviews on your blog - Economy
Inbox - Personal portal - Startpage
Incentaclick - Make some money on accepting ads on your blog or website - Marketing
Inchicks - Digg for women - Rate
Incident1 - Maps 911 calls (USA) - Geo
Incircles - Add a chat app to your blog - Communicate
Indaba - Jam & record music - Audio
Indeed - Finds jobs on what & where - Employment
Indiekarma - Pay a cent to see a blog - Economy
Indiepad - Buy or sell indie music - Audio
Indistr - Sell or buy independent music - Audio
Indiza - Tag-based bookmarks - Bookmark
Industriouskid - Kid0friendly, parent-approved websites & apps - Community
Industrybrains - Make some money on accepting contextual ads on your blog or website - Marketing
Inetword - web-based word processing - Office
Infogami - Create websites - Software
Infominder - Create RSS from websites - RSS
Inform - Personal news portal - Startpage
Inkling* - Social delphi, exchange for futures - Game
Innertee - Design, mix, wear, share & sell - Ecommerce
Inods - Shopping review aggregator - Ecommerce
Inpowr - Plan, play & progress in every area of life - VAS
Insideflyer - Convert loyalty points - Ecommerce
Insiderpages - Social directory guide - Ecommerce
Insightreuters - Customise your news & consult your peers - News
Insolitus* - Upload & share all your files & docs - Multimedia
Instacalc - Online calculator - Office
Instacoll - Collaborate on documents - Productivity
Instan-t - Meta messenger - Communicate
Instantdomainsearch - Ajax domain search + suggestions - Search
Instantfeed - Messenger notifications of feeds - RSS
Instantnotes - Bookmark & leave notes at web pages - Knowledge
Instantrails - Runtime solution containing Ruby, Rails, Apache and MySQL - Software
Instructables - Share what you make & how you made it - Knowledge
Intellishop - Make money on shopping & writing a review - Economy
Interact10ways* - Interact with Getty images - Images
Interactionchat - Chat with your site's visitors - CRM
Interfax - Web2fax - Communicate
Internetaddressbook**~ - Find & be found, with all your 2.0 profiles - Identity
Interraproject - Do & consume good with your credit & debit cards - Economy
Intervals - Organize & manage projects - Productivity
In-the-casino - Gambling online community - Gamble
Intrade - Trading exchange for prediction markets - Gamble
Intravnews - RSS reader (Windows) - RSS
Intronetworks - Social networking solutions - Software
Introplay - Exercise, track your fitness & play together - VAS
Intute - Validate & share academic information - Knowledge
Inventiondb - Create & share online project space - Productivity
Invideo - Make money on free, customizable, brandable video player - Marketing
Inviteshare* - Get on waiting list for beta releases - Marketing
Invitika - Organize, report & share events thru your cell - Community
Invitr - Upload & share photos - Images
Involver - Publish, explore & share events - Office
Iomega - Backup service - Store
Iotum - Sorts & processes calls on relevance - Communicate
Ioutliner - Manage tasks & projects - Productivity
Ioweyou - Manage loans & shared expenses - Finance
IP2location - Create trend charts for site traffic - Data
Ipings - Ping service - RSS
Ipolipo - Schedule meetings & events - Office
Iprioritize - Manage your tasks - Productivity
Ipselon - Meta search - Search
Ipubble - List & promote your website & have it reviewed - Community
Iqzone - Upload photo & text for classified ads thru your cell phone - Ecommerce
Ironmountain - Backup service - Store
Irows - web-based spreadsheet - Office
Isabont - Keep track of your job search activities - Employment
Iskoot - Call people on your online buddylists - Communicate
Islandoo - Temporary (?) community for tv show's casting - Community
Isnooze - Laptop & iTunes mash-up as alarm clock - Productivity
Isolatr - Isolate yourself from requests http://isolatrcom/ - Fun
Isporty (olim Tiredandtested) - Sports community - Community
Ispott - Mobile treasure hunt - Game
I-spy - Community based meta search - Search
Issuetrackerproduct - Deal with problems together - Productivity
Istalkr - Aggregate & organize rss services that you & your friends subscribe to - RSS
Istockphoto - Buy & sell images - Images
Italknews - Digg news & get paid for it - Rate
Iterating - Wiki-like software guide - Publish
Itlinkz - Network of social networking sites - Marketing
Itredux* - Concise categorized database of Office 2.0 companies - About
Itsastart - Personal portal - Startpage
Itsdex - Trading game in 2.0-related shares & bonds - Game
Itsjustlunch - Lunch dating for professionals - Date
Ittoolbox - Community for IT professionals - Community
Itunes - Apple's music download store - Audio
Itunestreemap - Track the iTunes Top 100 songs as they move up and down the charts - Data
Itzbig - Explore relevant career oportunities, find relevant candidates - Employment
Itzle - Chat with other site visitors - Communicate
Iugen - Publish your profile & see how connected you are - Community
Iupload - Enterprise multi-user blogging, wiki, cms - Publish
Iusethis - Digg, discover, check & organize your apps - Rate
Iwantto - What do you want to do or make online? - About
Iwiw - Find your friends - Community
Izimi - Share everything, from your pc - Multimedia

Update 070527, 070831.

Web 2.0 alphabetical: from Jabbin to Mywebranking

Italic = new to this index.

JJJ
Jabbin - PC2PC voip (Jabber client) - Communicate
Jabbits - Ask questions, watch answers - Knowledge
Jabphone - Messenger2phone - Communicate
Jaduka - Call-us-now features for all online media - Marketing
Jagbox - Store & send - Store
Jahia - Content management system - Software
Jaiku - Social phone directory showing where you are (Nokia S60 2nd ed.) - Community
Jajah - Free phone calls, glocally - Communicate
Jalbum - Web-based album tools - Images
Jambase - Personalized news on live music - Audio
Jambo - Discover who's nearby & reconnect live - Community
Jamendo - Review, tag, rate & share music - Audio
Jamglue - Upload, edit, publish & share remixes - Multimedia
Jamjar - Flash collaboration suite for small groups - Productivity
Jamjunky - Jam & record music - Audio
Jamnow - Jam & record or cast music - Audio
Jangl - Hide your cell phone number - Communicate
Jauntlet - Track & trace yourself - Geo
Javakicks - Digg Java news - Rate
Jaws - Content management system - Software
Jaxtop - Personal start page - Startpage
Jaxtr - Link your phone to the web - Communicate
Jellybarn - Upload, edit, manage, share your photos - Images
Jellyfish - Shopping search engine - Ecommerce
Jeteye - Clip & share (parts of) web pages - Bookmark
Jibberjobber - Manage & organize a job search - Employment
Jibdig - Instant messenger - Communicate
Jibjab - Create & share your funniest stuff - Community
Jigsaw - Subscribe, buy, sell sales contacts - Marketing
Jimdo* - Create your website for free - Publish
Jimmystv - Post, watch & share videos - Video
Jinzora - Store & play your music & videos - Audio
Jippy~ - Share your birthday calendar & get reminders to congratulate friends thru email, ecards or sms - VAS
Jira - Issue tracking - Productivity
Jive - Enterprise forum solution - Software
Jivetalk - Meta instant messenger - Communicate
Jiwire - Locate & map Wi-fi hotspots - Wi-fi
Jmsn - Instant messenger (Java) - Communicate
Jobalize - Get yourself on the map as a Web 20 specialist - Employment
Job-a-matic - Post job listings & publish job board to your site - Employment
Jobaria - Shoot job interview & link to it in your resume - Employment
Jobazaar - Tagged job offerings - Employment
Jobberwiki - Share job knowledge & experience - Employment
Job-brokers~ - Submit your resume & get job offers - Employment
Jobburner - Job board for techies - Employment
Jobcoin - Get a mini job board on your website & make money on it - Employment
Jobfox - Profile based job board - Employment
Jobmeeters - Job board community (French) - Employment
Jobneters - Job vacancies & map mash-up (UK) - Employment
Jobomatic - Add paid job listings to your site - Employment
Jobpile - Job search engine - Search
Jobsandgigs - Job board for designers & web developers - Employment
Jobsearch20 - List of job boards 2.0 - About
Jobsearcheasy - Job search engine, win prizes - Search
Jobster - Profile based job board - Employment
Jobthread - Start a job board or add paid listings to your site - Employment
Jobtonic - Find a job or refer to one & get a reward - Employment
Joesgoals - Manage & share your tasks - Office
Joga - Nike + Google community - Marketing
Join2growbiz~ - Community for European entrepreneurs (by Fortis Bank) - Community
Jookster - Search, rank & share - Search
Joomla - Content management system - Software
Joopz - Web2Text & Text2Web - Communicate
Joox - Open Joost - Video
Jossle - Submit & rate political news - Rate
Jotcloud - Leave notes on websites - Office
Jotform - Make your Ajax webforms - Office
Jotlet - Share your schedule online - Office
Jots - Information sharing - Knowledge
Jotspot - Take one set of notes, live - Office
Jott - Voice & text 2 email & mobile - Communicate
Joyent - Collaboration tools - Productivity
Jpegr - Publish & share photos - Images
JPG - Submit, phlog & vote on photos - Publish
JS-Kit - Add comment features to your website - Software
Jtrac - Track Java app issues - Software
Jubii - Webmail solution - Communicate
Judysbook - Review & rate your neighbourhood - Ecommerce
Juice - RSS reader (Windows) - RSS
Juicecaster - Upload & cast cell photos & videos - Publish
Jukeboxalive - Upload & share, promote & sell your music & gigs (for indies) - Audio
Jumbodir - Store & share - Store
Jumpchat - Instant messenger - Communicate
Jumpclaimer - Inform your relatives about your whereabouts thru sms - Communicate
Jumpcut - Create, explore, remix & share movies - Video
Jumptap - Mobile search solutions - Software
Jungledisk - Store your data - Store
Junkdepot - Buy & sell everything for/from your home - Ecommerce
Junklog - Rate, review & share media - Multimedia
Jupiter - Portal management system - Software
Justanger - Express & share your anger - Publish
Justanswer - Make money on sharing your knowledge - Economy
Justcurious - Q&A at random - Fun
Just-ping - Ping service - RSS
Juststepsaway - Deep filtered vertical search for vacation rentals - Search
Justupit - Store & send - Store
Juvino - Reroute your mobile calls and texting - Communicate
Jux2 - Meta search - Search
Juxel - Tag interfaced porn - Porn
Jyve - Get live answers on your questions - Community

KKK
Kablogs - Submit & rate special interest articles for bloggers - Rate
Kaboodle - Information sharing - Knowledge
Kakorama - Compose & upload your ringtone for free, find out what happened on the day you were born, plus IM service - VAS
Kalabo - Collaborate on compositions - Productivity
Kancept - Submit design concepts and have them reviewed & rated by other users - Design
Kaneva - Digital entertainment marketplace (3D) - Multimedia
Kanoodle - Sponsored links services - Marketing
Kanosis - Upload your files & use extra apps (MLM) - Store
Kaosweaver - Dreamweaver extensions - Software
Kapaza~ - Free classified ads marketplace - Ecommerce
Karmadu - Thank people by sending them karma points - Community
Karmus - Create, share & contribute to cards - Community
Kartoo** - Clustered, mapped search - Search
Kayak - Price comparison with user input for travel - Ecommerce
Kayakbuzz - Find cheap destinations; Google Maps mash-up - Ecommerce
Kayuda - Mindmap tool - Productivity
Kaywa - Publish & share multimedia on web & cell, using sema code - Multimedia
Kcoolonline - Search & download videos - Search
Kdice - Multiplayer strategy game using Google's web toolkit - Game
Keegy* - Location aware news generator - News
Keepm - Contact management tool - Office
Keepmytime - Web-based timekeeping - Productivity
Keepvid - Search & download videos - Search
Keepyousafe - Digital safe deposit box - VAS
Keotag - Keyword and tag search - Search
Kepty - Publish about web, get rated & get paid for it - Publish
Kerpass - Personal security software for web & mobile - Identity
Kevo - Collaborate on VIP's biographies & gossip - Productivity
Kewego~ - Publish, rate & share videos - Video
Keyworddensitychecker - Visualizes keywords (metatags) in clouds - Tag
Kickapps - Adds 2.0-things and video to your website - Software
Kickrss - Blend several feeds into 1 - RSS
Kickshype - Submit & rate (articles on) sneakers - Rate
Kidlinkz - Bookmark for your kids - Bookmark
Kiko - Online calendar - Office
Killerstartups - Digg start-ups - About
Kingping - Ping service - RSS
Kinja - Search blogs - Search
Kishkish - Detect lies thru phone - Communicate
Kisstokiss - Dating - Date
Kissyoutube - Search & download videos - Search
Kitbit* - Publish & share your opinions - Productivity
Kittenauth - Protection against spambots - Software
Kiva* - Give a micro credit to an entrepreneur from a developing country - Economy
Klabol - Web 2.0 list - About
Klipfolio - Personal portal - Startpage
Klostu - Aggregate all your communities in this one - Community
Klostu* - Connect yourself to all message boards, communities & people - Identity
Kluskring~ - Share ideas & knowledge on DIY - Community
Kmfavorites - Social bookmarking - Bookmark
Knacktion - Share & sell your talent & content - Economy
Knover - Discover who's connected to what & whom - Search
Knowbrainers - Q&A - Knowledge
Knowbrainers - Q&A - Knowledge
Knowmore - Consumers unite - Economy
Knownow - Connecting data, apps & people - News
Kodakgallery - Upload, publish & print photo(book)s on demand - Publish
Koders - Search code - Software
Kolektors - Create, manage, access & share your collections - List
Kompoz - Compose & share music together - Productivity
Kongregate - Gamers community - Game
Konnects - Networking for professionals - Community
Kontera - In-text advertising - Marketing
Koolanoo - Jewish social network - Community
Koolim - Meta messenger - Communicate
Koolweb20 - Find & rank 2.0 websites - About
Kopete - Meta instant messenger - Communicate
Kopete - Universal messenger - Communicate
Koral - Content & document management system - Software
Koreacrunch - Reviews Korean 2.0 companies - About
Kosmix - Vertical search - Search
Kowari - Store, retrieve or analyse metadata - Data
Kramkoob - Submit your online properties for 1 second fame - Marketing
Kramkoob - Submit & share your site, blog, auction, news, vidcast or podcast - Marketing
Krang - Content management system for magazine websites - Software
Kratia - Search, vote & rank results - Search
Krawlerx - Create, search, share & build community around your media - Community
Kraytiv - Bookmark pages relating to creativity - Bookmark
Krop - Job board for creatives - Employment
Krugle - Search open source software - Software
Krunch - Email files - Store
Ksolo - Record & share karaoke songs - Audio
Kuler - Publish, rate & share colour schemes - Design
Külist - Search, compare, bookmark best prices - Ecommerce
Kuscash* - Mobile digital wallet - VAS
Kwidge - Create funny edit of your photo & share it (PRS) - Images
Kwizzical - Play quiz & share or donate money - Game
Kyte - Create & broadcast TV channels from web or mobile phone - Video

LLL
L8r - Send your email later - Communicate
Lala - Swam CDs, from July 4th - Ecommerce
Landcraft* - Render your own 3D landscape & share it - Images
Lastfm* - Profile your taste, share, personalize your radio - Audio
Laszlo - Web 2.0 software - Software
Latengo* - Upload or publish & share all your digital things (German) - Multimedia
Launchcast - Create your own web radio stations - Audio
Launchpad - Host, manage & collaborate on free software - Software
Launchtags - Publish & share your knowledge on a mini-page - Publish
Lawfavorites - Submit & rate special interest articles for lawyers - Rate
Layoffspace - Community for the unemployed - Employment
Lazybase - Create, manage & share databases - Data
Leadpile - Make some money on accepting ads on your blog or website - Marketing
Leafletter - Create mini website & distribute it as a microformat - Publish
Leapfile - Store & send - Store
Learning20 - Online speed course on 2.0 - About
Leetdaily - Submit & rate articles on gaming - Rate
Leftoverlunch - Share your leftovers - Fun
Legalforce - Buy, sell & license patents - VAS
Lemonzoo - Upload, rate & share funny media - Multimedia
Lendmonkey - Trade everything - Economy
Lessaccounting - Simple SME bookkeeping & sales management solution - Software
Letspowwow - Meet & work together on documents - Productivity
Letsprove - Organize & manage projects - Productivity
Letterpop - Create & send out newsletters - Publish
Leve1 - Share news - News
Lexxe - Meaningful search - Search
Librarious - Catalogue your collection - List
Librarything - Catalogue & share your library - List
Libsyn - Syndicate podcasts - Audio
Licketyship - Home-delivery supermarket; retail & couriers co-operation - Ecommerce
Licketytrip - Last minute vacation rentals (map mash-up) - Ecommerce
Licq - Instant messenger (ICQ-like, Linus) - Communicate
Lifeio - All to the people (stealth) - Software
Lifelogger - Share audio, video & photos - Multimedia
Lifesterblog - Publish & share & connect with friends - Publish
Lifetango - Publish your goals & ask others to support you - Productivity
Lifetrackers - Write your own book, compile an album, alone or with friends & print it - Publish
Lifetype - Blogging software - Publish
Lightenment - Publish & share reviews of gadgets - Ecommerce
Lighthouse - Manage & track issues - alone or in groups - Software
Lightstalkers - Networking & discussion tools for professional travellers - Community
Lijit* - Social contextual search - Search
Like - Find article you want and do a likeness search - Search
Lilisto - Social bookmarking - Bookmark
Limbo (olim Limbo41414) - Participate in lowest unique bid auctions & sweepstakes - using your cell - Game
Lime - Help & inspire each other - Productivity
Linatree - Download, print & assemble your photo camera - Personal manufacturing
Lingr - Chat community - Communicate
Linkademic - Social bookmarking - Bookmark
Linkatopia - Social bookmarking - Bookmark
Linkconnector - Make some money on accepting ads on your blog or website - Marketing
Linkedfeed - Folksonomied news - News
Linkedin - Manage and share your cv - Community
Linkedwords - Search with context - Search
Linkfilter - Digg news - Rate
Linkgrab - Submit & share links on design - Design
Linklike - Link exchange - Marketing
Linklog~ - Social bookmarking - Bookmark
Linkmybox - List & share all your online presences here - Identity
Linknsurf - Track & share blogs on your mobile - Publish
Linkput - Results with sure input - Search
Linkroll - Social bookmarking - Bookmark
Linkrss - Create, store & syndicate your own rss feeds - RSS
Linkshare - Make some money on accepting ads on your blog or website - Marketing
Linkup - Job search engine - Employment
Linkworth - Make some money on accepting ads on your blog or website - Marketing
Lipstick - Submit & rate celebrity news - Rate
Lirama~ - Upload, explore & share song lyrics - Search
Lisensa - Manage your digital rights through licensing - VAS
Listal - List & share all your media - Multimedia
Listd - Accelerate your Ebay listings - Ecommerce
Listerlister - Create, share & vote for lists - List
Listfoo - Create & share lists - List
Listible - Folksonomied software & code search - Bookmark
Listigator* - Create, edit & share lists - List
Listio - Submit & vote for Web 20 concepts - About
Listmixer - Social bookmarking (temporary links) - Bookmark
Listofbests - List & share products, places, people, goals, etc - List
Listofweb20 - List of lists with Web 2.0 websites - About
Listography - Publish, share or read lists - List
Listpool - Create, manage & share to-do lists - Productivity
Listr20 - Lists "all" Flickr-like spelled domain names - Fun
Listsomething - Share any list to buy & sell things, services - Economy
Liszen - Search blog articles for librarians - Search
Litefeeds - RSS reader (mobile) - RSS
Litepost - Webmail - Communicate
Literature-map - User-built literature database - List
Litespellchecker - Check spelling as you type - Office
Littlewiki - Create wiki pages - Publish
Live - Personal portal - Startpage
Live365 - Search web radio stations - Audio
Livedigital - Store, share, produce, distribute your content - Multimedia
Livedoorsearchbox - Search in IE window border - Search
Livejournal - Join or create your own community - Community
Liveleak - Upload & share sensational videos - Video
Livelocker - Digg multimedia - Rate
Livemansion - Create & produce a feature film together - Productivity
Livemarks - Live update of Delicious - Bookmark
Livepagerank - Track your site visitors geographically - Data
Liveplasma* - Search & find other things to your taste - Search
Livesearch* - Refine your search while you type - Search
Livevideo - Upload, explore, rate & share videos - Video
Llor - Build your street - Game
Lo8os - Graphic design gallery & community - Images
Localhostr - Store & send - Store
Locallive - Windows maps - Geo
Localpoint~ - Google mash-up with several (Dutch) dbases - Geo
Locomotive - Ruby on Rails development tool for Mac OS X - Software
Locr - Organize photos using geo information - Images
Logahead - Blog solution - Publish
Logolinks - Visual links to Chinese Web 20 services - About
Logopond - Submit, rate & discuss graphical design - Images
Logotwo - Vote for Web 2.0 logo designs - Design
Lokad - Business intelligence solution - Software
Loki* - Search & navigate web & real life - Search
Longbets - Prediction competition for charities - Gamble
Longjump - Collaboration tools (& customizable apps) - Productivity
Longtimelost* - Find back lost friends thru Google - Search
Lookery - Ad network for companies publishing apps on Facebook - Marketing
Looklater - Private bookmarking - Bookmark
Lookmarks - Social bookmarking - Bookmark
Lookthisup - Social bookmarking - Bookmark
Lookupahookup - Create or join an expert or experience group - Knowledge
Loomia - Folksonomied media search - Multimedia
Loopnote - Notification webware - Office
Loopt* - Find & share your friends & media on your mobile (cool demo!) - Geo
Loosestitch - Create & collaborate on task lists - Productivity
Loowa - Claim your email address, share your profile - Community
Lopico - Social business directory - Ecommerce
Lordoftv - Watch over 1,000 channels - Video
Lostcherry - Social network for youngsters - Community
Lostkeys - Lost & found for keys - Economy
Loudblog - CMS inc - Publish
Loudervoice - Explore, blog about & rate reviews - Publish
Loudlaunch - Make money on blogging about advertising campaigns - Economy
Lovento - Find friends & events - Community
Lowlandsguide~** - Explore the lay of the Lowland Festival with this mobile app - Geo
Lphanr - Multi compatible P2P file sharing - Multimedia
Lucidera - Business intelligence solution - Software
Lulu - Publish & sell your content - Multimedia
Lumosity - Test & train your brain - VAS
Lumrix - Semantic search engine - Search
Lunchprodigy - Process your lunch orders online - Office
Luvup - American version of Zuzu - Office
Lyceum - Enterprise multi-user blogging - Software
Lycosiq - Social bookmarking + Q&A - Bookmark
Lyrics~ - Share lyrics & music information - Productivity
Lyricwiki - Collaborate on lyrics database - Productivity
Lyro - Publish, manage & share contact data - Identity

MMM
Mabber - Mobile messenger - Communicate
Mackicks - Digg Mac news - Rate
Madville - Submit & share mad stuff - Community
Maestro - Upload & share your music - Audio
Magg - Aggregates movies from many websites - Video
Magnatune - Music download store - Audio
Magnolia - Social bookmarking & voting - Bookmark
Magnoto - Phlog & blog - Multimedia
Magumastudio - Integrated development environment for PHP - Software
Mahalogreenhouse - Make money on submitting websites to a directory - Economy
Mail2RSS - Inmail2RSS - Communicate
Mailbigfile - Mail large files - Store
Mailchimp - Design & code your newsletter, and have it distributed - Marketing
Mailemotion - Create & send videomail - Communicate
Mailfriends - Penpals site - Communicate
Mailinator - Disposable email + spam mash-up - Geo
Mailmydisc~ - Exchange your media - Economy
Mailvault - Store, process & encrypt your email - Communicate
Mainada - Create & share comics - Publish
Majestic12* - Distributed search engine - Search
Majikwidget - Customize & integrate widgets on your blog - Software
Makemewatchtv - Repackage video news - Video
Makidi - Search for people (?) - Search
Mamjam - Location based instant messaging - Communicate
Mamma - Meta search - Search
Managee - Content management system - Software
Mangeloo - Run IM on all devices & everywhere - Communicate
Mangezmangez - Publish, review & share restaurant information - Community
Mansion - Betting exchange - Gamble
Manyworlds - Explore business info reviewed & ranked by experts - Knowledge
Map24 - Route finder; 3D - Geo
Mapable - Build & share chatrooms & communities - Community
Mapbuilder - Mash-up your own maps - Geo
Mapchatter - Chat on maps - Communicate
Mapdango - Classified job ads - Employment
Mapeire - User generated lowest price finder; Google Maps mash-up - Ecommerce
Mapicons - Create pin icons for maps - Design
Mapicurious - Create maps - Geo
Mapkit - Create & share your own map - Geo
Maple - Social bookmarking - Bookmark
Maplib - Turn every photo or illustration into an interactive map - Geo
Mapmix - Find your friends (map mash-up) - Community
Mapmyrun - Plot & share your run route - Geo
Mappedup~* - Map your feed sources geographically - RSS
Mappr - Map Flickr photos per tag - Geo
Mappyhour - Maps bars & their happy hour specials - Geo
Mapquest - Look up local businesses, get driving directions - Geo
Map-runner - Create & share run-maps - Geo
Mapsack - Map, discover & share places - Geo
Mapshark - Search maps in many websites - Geo
Maps-quiz - Where is that-quiz (addictive!) - Game
Mapstars~ - Refers to map mash-up tools & experiments (many Dutch) - About
Mapstats - Check your PR - Data
Mapsurface - Map blog traffic - Data
Maptales - Map trips - Geo
Maptrot - Create & share maps - Geo
Mapul - Map your mind - Productivity
Mapwii - Map your WII number & challenge other players - Geo
Mapwing - Create, explore & share virtual tours - Images
Marco - How not to launch a Web 2.0 site - About
Marijuananation - Submit & rate articles on marijuana - Rate
Markaboo - Bookmark & share anything - Bookmark
Marketpicks - Digg for stock information - News
Marktd - Digg marketing stories - Marketing
Markthisdate~ - Publish & share events - Knowledge
Mashable - 2.0 blog - About
Mashcodes - Get social networking tools (hosted by Mashable) - Software
Mashery - API management solutions unlocking web services channels - Marketing
Mashmap - Find movies & showtimes (map mash-up) - Ecommerce
Mashplanet - Find & submit mash-ups per category - Geo
Mashupfeed - RSS alerts for mash-ups - About
Matador - Global travel community - Community
Matchactivity - Connect to likeminded people - Date
Matchbook - Betting exchange - Gamble
Matchmine* - Get matched to movie content - Video
Matchmypet - Find a date for your pet - Search
Matriceservices - Web 2.0 annotated logo cloud - About
Maxigate - Social bookmarking desktop - Bookmark
Maxthon - Tabbed browser, IE-compatible - Browse
Mayasmom - Something with parenting - Community
Mayomi - Mind map & share - Productivity
Maywehelp - Surf any web page & Chat with other site visitors - Communicate
Mb3dengine - Animated Digg-cloud - Search
Mblox - Mobile wallet community - VAS
Mcabber - Instant messenger (Jabber client, Linux and Mac) - Communicate
Mdpro - Content management system - Software
Me* - Build, manage & exploit your online community - Community
Measuremap - Web stats - Data
Mecamessenger - Meta instant messenger - Communicate
Mecanbe - Share your goals and inspirations - Productivity
Medgle* - Medical search - Search
Mediabum - Upload, explore, rate & share funny videos - Video
Media-convert - Convert videos to other formats - Video
Mediaconverter - Convert videos to other formats - Video
Mediafed - Make some money on accepting ads in your rss feeds - Marketing
Mediafire - Limitless up&downloads - Store
Mediamashup - Create, mix & share media - Multimedia
Mediamaster - Backup service - Store
Mediamatrix - Isolate, segment & annotate media - Multimedia
MediaMax* - Store, manage & share media - Multimedia
Mediasilo - Digital asset management - Video
Mediatuner - Manage text & rich media feeds - Multimedia
Medical-articles - Submit & rate medical articles - Rate
Medio - Mobile search & recommendation engine - Software
Meebo - Integrates several messengers - Communicate
Meemo - Mobile email service - Communicate
Meet-a-local - Find local hosts in other cities (German) - Community
Meetmoi - Mobile dating - Date
Meetro - Find friends nearby (thru messenger) - Community
Meetup - Find common interests & organize meetings - Community
Meetwithapproval - Organize & manage meetings - Office
Meevee - Search, upload, share, review & vote tv content - Search
Meez - Create & share your 3D avatar - Identity
Mefeedia - Find & subscribe to vlog video streams - Video
Megabuzz - Participate in buzz game & win prizes - Game
Megaupload - Store & share - Store
Megite - Discover & help select news - News
Melodeo - Listen to, share, discuss & create podcast playlists, on your cell - Audio
Memeorandum - Folksonomied news summaries - News
Meme-stream - Digg funny things - Rate
Memetrics* - Optimize your marketing across media - Marketing
Memigo - Digg news - Rate
Memory - Memory + Yahoo images mash-up - Game
Memotoo - Office online (French) - Office
Memstream - Bookmark, rank & share interesting news - News
Mendix*~ - Semantic application development - Software
Meraki - Free wi-fi network - Wi-fi
Mercora - Search music & get recommendations - Audio
Mercury - Instant messenger - Communicate
Merit - Treemap for Marine Corps Equipment Readiness Information Tool - Data
Messagemate - Meta instant messenger - Communicate
Messagr - Find & communicate with people with matching interests or knowledge - Communicate
Messengerfx - Instant messenger - Communicate
Meta - 2.0 forum solution - Software
Metacafe - Upload & share video - Video
Metadot - Build your own website, intranet, portal - Software
Metafilter - Digg web projects - Rate
Metaglossary - Meta web search for word definitions - Office
Metarss - Reader, (re)publisher, meta search & keyword feed generator - RSS
Metathings - Aggregate & share all your online personal profiles - Identity
Metatube - Search +100 video sharing sites - Search
Metaweather - Put aggregated weather feeds on your site - RSS
Metawishlist - List & share your wishes - List
Mfoundry - Develop & deploy mobile apps, rapido - Software
Miaplaza - Connect with friends, family etc. - Community
Micq - Meta instant messenger (ICQ-based) - Communicate
Microsoftresearch - Make money by participating in Microsoft's research - Economy
Midgardcms - Content management system - Software
Midnightcoders - RIA, Ajax & Flash platform - Software
Midomi - Search music by making music - Audio
Mig33 - Chat, text & call your friends - Communicate
Mightyv - Web-based tv search & epg (UK) - Video
Mikons - Create & share your own icons - Community
Mileguru - Aggregate all your loyalty points on 1 page - Finance
Millennialmedia - Mobile marketing solutions - Marketing
Millennialmedia - Mobile marketing solutions - Marketing
Milliondollarhomepage* - Buy pixels to finance study - Economy
Millionsofgames - Review & share games - Game
Mimeo - On demand printing, binding & delivery - VAS
Mind42 - Mindmap tool - Productivity
Mindjot - Make & share notes - Office
Mindmeister - Collaborative mind mapping - Productivity
Mindomo - Mindmap tool - Productivity
Mindpicnic - Choose a course, learn online - E-learning
Mindpicnic* - Share & learn from online knowledge - E-learning
Mindquarry - Collaboration tools - Productivity
Minggl - Profile aggregator - Identity
Minglenow - Connect with places & people - Community
Miniajax - Free Ajax & dhtml code library - Software
Miniboxs - Start page ("RSS magazine") - Startpage
Minitellus - Share your experience with & meet students - Community
Minowireless - VoiP on your mobile - Communicate
Mint - Blog stats - Data
Minti - Parents community - Community
Minutesinaminute - Create & share meeting minutes - Office
Miranda - Instant messenger - Communicate
Miro* - Open video player - Video
Mirpod - Tuner, radio & tv to play RSS feeds or xspf - Multimedia
Mister-wong - Social bookmarking (German) - Bookmark
Mitup - Set up, manage & invite to meetings - Office
Mix - Explore, upload, download & share playlists & public mixes - Audio
Mixbook - Create & publish books together with friends - Publish
Mixd - Text & send pics & vids to groups of friends - Communicate
Mixercast - Mix your own media with professional footage & publish it - Video
Mixpo - Present yourself in multimedia - Publish
Mixtaping - Upload & share songs, compilations & mixes - Audio
Mizpee - Share information on nearby loos - Community
Mkmap - Collaborate on local maps - Geo
Mmbase - Content management system - Software
Mmmzr - Buy space on this page now, or your price doubles - Marketing
Mmoguildsites - Manage your MMORPG clan's hosting & community needs - Software
Mmotr - Automotive (dating) community - Community
Mnemo - Refine your search terms - Search
Mobango - Discover & share mobile media; ; marketplace for syndicated content - Multimedia
Mobbah~ - Email or wap your photo + location - Communicate
Mobber - Create instant community & chat while you surf - Community
Mobilcast - Search podcasts - Search
Mobile20 - Wiki about mobile 2.0 initiatives - About
Mobilealibi* - Online safe deposit box - VAS
Mobilecomplete - Test your mobile apps on all devices - Software
Mobiledistillery - Port mobile Java apps to 550 phones, rapido - Software
Mobileglu - Web services to your mobile - Startpage
Mobileinternetmanifesto - Vision on Mobile 2.0 - About
Mobilereporters~ - Upload & share your video - Video
Mobilicious - Mobile social bookmarking - Bookmark
Mobilitybeat - Submit & rate mobile tech news - Rate
Mobiluck - IM, text & share media on your mobile - Community
Mobio - Lean mobile lifestyle apps & content - Software
Mobispine - Mobile feed browser - RSS
Mobispirit - Platform for mobile apps - Software
Mobitv - Get tv & radio on your cell & laptop - Video
Mobivox - Free or cheap international mobile calls - Communicate
Mobixie - Create, explore & share mobile content - Multimedia
Moblee - Opt in to offers direct to your mobile - Ecommerce
Mobloco - Get daily text alerts on things happening near to you - News
Moblr - View or upload & share mobile content - Multimedia
Mobo - Order food on the go, get discounts & avoid waiting lines - Ecommerce
Mobsaver - Price comparison thru your cell - Ecommerce
Mobspray* - Create & share graffiti in places thru mobile2RFID - Game
Mobunga - Share & discover multimedia from multi devices - Multimedia
Mochikit - Suite of JS libraries - Software
Mochilla - Buy & sell your media content - Multimedia
Mochimention - Leave & share comments & ratings anywhere online - Rate
Mockingbird - Collaborative design (Stealth) - Design
Modoshi - Shopping community - Ecommerce
Modx - Open source PHP application framework - Software
Mofile - Upload & share your files - Store
Mog - Share your playlists (automated) - Audio
Mogopop - Publish & share iPod content - Multimedia
Mogspot - Submit & rate special interest articles for gamers - Rate
Mogulus - Video cast tool - Video
Mojiti - Share your annotated videos - Video
Mojizu - Create & share characters - Community
Mojoflix - Upload & share vids - Video
Mojopac - Run any app on any device - Software
Mojungle - Live phlogging & vlogging - Publish
Moka - Subscribe to book wisdom delivered thru sms - VAS
Mologogo - Share where you are - Community
Momb - 2.0 list - About
Mommybuzz - Moms connect with moms - Community
Moneytrackin' - Manage your budget & expenses & share it - Finance
Moneytwins - Exchange currencies without banks - Finance
Monitor110** - One-stop semantic financial research suite - Search
Monitorus - Personalized portal - Startpage
Monkeybites - 2.0 blog - About
Monkeyon - Remind someone else on to-dos - Productivity
Monster - Job board - Employment
Monsterdare - Create, do or sponsor a dare - Community
Montage-a-google - Tag based random photo montage; Google mash-up - Game
Montastic - Monitor your website - Software
Monthlydollar - The world's 1st internet employee - Fun
Moo - Use Flickr photos into printed business cards - Images
Moob - Party scene community - Community
Moodle - Course management system for learning communities - E-learning
Moodviews~ - Site analytics software - Data
Moodviews~* - Track or predict global mood levels (based on Live Journal) - Survey
Mooflex - CMS for forums - Publish
Mooglets - Startpage - Startpage
Moola - Win millions with sponsored game (stealth) - Marketing
Mooter - Clustered search - Search
Mootion - Submit & rate & videos - Rate
Mootools - Object-oriented JavaScript framework - Software
Moqvo - Upload & share your media - Multimedia
Moremap - Map mash-up showing earthquakes, traffic, radio stations etc - Geo
Morguefile - Public image archive - Images
Mosaicglobe - Upload & share photos, artwork, ideas - Multimedia
Mosexindex - Submit & rate porn - Rate
Mosh - Upload, share & browse all your stuff on your mobile (Nokia) - Multimedia
Mosthired - Aggregates job vacancies from other 2.0 job boards - Employment
Mostrips - Upload & share photos - Images
Mosuki - Hear about events from people you know - Office
Mothersclick - Share knowledge on motherhood - Community
Mothrfuckr - Submit & vote for the worst of Web 2.0 - Fun
Motionbox - Edit & share videos - Video
Motionmall - Design & insert webads - Ecommerce
Motiono - Upload & share your videos with friends - Video
Motleyfoolcaps - Pool your knowledge on stock buying - Finance
Motormapusa - Locate or find vehicle for sale on Ebay - Ecommerce
Motorpulse - Digg cars - Rate
Mousebrains - Thought starter for advertising creatives - Knowledge
Movamessenger - Meta mobile instant messenger - Communicate
Movavi - Convert videos to other formats - Video
Movedigital - Store & send - Store
Movenetworks - Measure & analyse each video viewer experience - Software
Movers20Top100s of daily/weekly/monthly Web 2.0 movers (based on Alexa) - About
Movielens - List, review & discuss films - Video
Moviemasher - Add video editing to your website - Video
Movietally - Catalogue, recommend & share movie info - Video
Movingweb* - Blog about everything that moves (on) the web - About
Movoxx - Get localized & personalized alerts & coupons on your cell phone - Marketing
Mozeo - Text cast to & chat with your own group on your cell - Communicate
Mozes - Share information & people thru your mobile - Community
Mozesmob - Mobile Q&A - Knowledge
Mozilla - Browser add-ons & mash-ups - Software
Mozillakicks - Digg Mozilla news - Rate
Mozy - Upload & backup your files - Store
Mp3 - Community of artists & fans - Audio
Mp3rama - Submit & rate articles on MP3 - Rate
MP3tunes - Upload & listen to your music - Audio
Mpire - Track price trends when you shop - Ecommerce
Mpower - Create, edit & share your presentations - Office
Mrdealio - Compare & track prices - Ecommerce
Mscape - Connect media & experiences to real locations - Geo
Msgme - Communicate or advertise thru sms keyword service - Marketing
MSIG - Generate a 2.0-ish logo online - Images
Msinfocard - Microsoft's identity metasystem - Identity
M-spatial - Mobile local search solutions - Software
Mtmessenger - Meta instant messenger - Communicate
Mtraks - Buy or sell indie music - Audio
Mturk* - Complete simple tasks & get paid - Economy
Mtvmobilevideo - Manage MTV media on your phone - Video
Mugshot - Upload & share photos, artwork, ideas - Identity
Muiso - Track your taste, get recommendations - Audio
Multiply - Store, share & discuss multimedia - Multimedia
Multipost - Make your own multipost bookmarklet tool - Bookmark
Multirss - Meta button to major RSS readers - RSS
Multitap - Share, rate, discuss & categorize screenshots - Game
Multi-touch* - Handy interface - Design
Multiverse - Network of MMOGs and 3D virtual worlds - Game
Mundu - Meta instant messenger - Communicate
Musestorm*** - Metasearch in Flash (several interfaces) - Search
Musicane - Buy or sell audio, video and ringtones - Multimedia
Musicarsenal - Music business management tools - Software
Musichawk - Share the artists you're into - Community
Musiclocated - Geolocate your music - Audio
Musicmap - Search & find other things to your taste - Search
Musicmesh - Explore music - Audio
Musicmobs - Share your tastes & find music - Audio
Musicnation - Upload & share, promote & sell your music & gigs (for indies) - Audio
Musicovery - Web radio from Liveplasma - Audio
Musicplustv - Enjoy clips, put in requests, chat with dj's - Video
Musicportl - Youtube & Flickr & blogs mash-up - Audio
Musicsack - Repository of data about people involved in music - Audio
Musicstrands - Tag, share & post music community - Audio
Musipedia - Search, edit, expand & share collection of tunes - Audio
Musocity - Music community - Audio
Mustseeblog - Comparison of Video 2.0 pages - About
Muveemix - Create, edit, upload & share videos - Video
Mvelopes - Manage your finances - Finance
My50 - List & share your to do things - List
Mybestplay* - Profile your skills in sports & find a new club - Employment
Mybet - Betting exchange - Gamble
Mybigfishgames - Review & share casual games & get rewarded - Game
Mybiggestcomplaint - Publish & share complaints - Publish
Mybigriver - Find while you type; Amazon mash-up - Search
Mybloglog - Stats for LiveJournal moods - Data
Mybookmarkmanager - Social bookmarking - Bookmark
Mybookmarks - Social bookmarking - Bookmark
Mybookyourbook - Register, list & swop books - List
Mybooo - Store & share content & services - Startpage
My-brand - Manage online advertising online - Marketing
Mycoogee - Access, store & share your cell's contents (client) - Multimedia
Mycool - Search, create & share special interest groups - Community
Mycybertwin* - Clone yourself into a chat robot - Communicate
Mydatabus - Store & share - Store
Mydeathspace - Directory of dead Myspace members - Community
Mydecide - Take decisions together - Productivity
Mydeo - Upload, store & manage videos - Store
Mydochub - Review & rate your doctor - Rate
Myemail - Check email anywhere - Communicate
Myfabrik - Store, manage & share your media - Store
Myfeedz - Customize your news & get recommendations - News
Myfilmz - List, review & discuss films - Video
Myfoodphone - Schedule a call to get you out of a situation - VAS
Myfootballclub - Collectively take over a soccer club, and then co-manage it - Economy
Myfreecopyright - Upload, digital fingerprint & publish - VAS
Myfreeimplants - Get a boob job or help her get one - Community
Myfrienemies - Connect with people, show & share the same dislikes, annoyances & disappointments - Community
Mygads - Compile info, access, update & share it thru phone, im, web, etc - Multimedia
Mygame* - Personalize your games - Game
Mygamma - Mobile community - Community
Myheritage - Upload & share photos & recognize faces - Images
Myhomepoint - Family calendar - Office
Myhommy - Personal portal (Israeli) - Startpage
Myhq - Social bookmarking - Bookmark
Myimager - Photo editor - Images
Mylid - Multi-protocol identity provider - Identity
Mylifebrand - Profile aggregator - Identity
Mylinkvault - Social bookmarking - Bookmark
Mylongtail - Optimize search engine findability - Marketing
Mylot - Make money on posting, commenting & participating in this social network - Economy
Myme - Create your online avatar - Identity
Mymediaroom - Publish & manage PR documents & info - Publish
Mymemorizer - Share calendar & get alerts - Office
Mymetar - Link to & share favourite metars, tafs & radar images - Images
Mymobilesite** - Mobile web server and site hosting (Nokia) - Software
My-moment - Share what you're doing & find new friends - Communicate
Mymovienetwork - Community for filmmakers - Community
Mymuesli - Order muesli according to your own specs (Germany only) - Ecommerce
Mymuv - Track lifestyle changes & trends - Productivity
Mynewplace - Find & rent your new home - Ecommerce
Mynoteit - Store & access school information - Store
Mynumo - Create, share or sell mobile content - Multimedia
Myopenid - Skip tedious profile form-filling - Identity
Myotherdrive - Backup service - Store
Myowndb - Organize & manage your data - Data
Mypaymentnetwork - Selfservice online payment service - VAS
Mypicklist - Share & recommend things you love - List
Mypictr* - Create & publish your profile pic for social softwares - Images
Mypip - Social bookmarking - Bookmark
Mypodcast - Host your podcasts - Store
Myprogs - List & find software - List
Myquire - Organize & manage groups - Productivity
Mysay - Communicate with friends through voice2web messages - Communicate
Myshape* - Find clothing matched to your body shape & preferences - Ecommerce
Mysindicaat - RSS reader (web based) - RSS
Mysource - Content management system - Software
Myspace - Communicate with & share content with your friends - Community
Mystickies* - Browse, search, sort & edit notes online - Office
Mystrands - Share your taste, get recommendations & party - Community
Mystyledesigns - Your body, your shape, your clothes - mass customized - Ecommerce
Mysupermarket - Compare products & prices of groceries - Ecommerce
Mytago - Semacodes to connect offline & online worlds - Tag
Mytheme - Animate images online - Images
Mythings - Show your things, get them valuated & protect them - Ecommerce
Myticklerfile - Manage your and others' tasks - Office
Mytimelines - RSS2Timeline - Productivity
Mytoons - Upload & share cartoon animations - Video
Mytriggers - Price comparison alert services - Ecommerce
Mytube - Upload & share photos, video, music - Multimedia
My-tuts - Social tutorial bookmarking (and soon: publishing) - Bookmark
Mytv - Upload, rate & share videos (German) - Video
Myvideokaraoke - Sing & share your song on video - Multimedia
Myvtc* - Share media & documents for generations to come - Community
My-wage - Share & benchmark your salary - Employment
Mywaves - Send web videos to your phone - Video
Mywebdb - Organize & manage your data - Data
Mywebdesktop - Personal & collaborative desktop functions - Office
Mywebranking - Check your Google ranking - Marketing

Update 070527, 070831.

Web 2.0 alphabetical: from Nabaztag to Pytagor

Italic = new.

NNN
N2yo* - Realtime satellite tracking - Geo
Nabaztag* - Get info & communicate thru wi-fi rabbit device - Communicate
Nabbr - Create & share lists - List
Naim - Encrypted instant messaging - Communicate
Nakedandangry - Design & share your wallpapers - Ecommerce
Nakido - Upload & share your files - Store
Namakkal - Store, share & tag bookmarks - Bookmark
Naslu - Store & share code - Software
Nat1ion - Chat while you surf - Communicate
Nationofmillions - Submit & rate hiphop - Rate
Nativetext - Translates rss in foreign languages - Office
Naughtyamerica* - Multiplayer video sexgame - Game
Naughty-au-naturelle* - Penthouse letters map mash-up - Geo
Nav4all~ - Mobile navigation app, claim & share places with friends - Geo
Navdog - Organize & manage events - Office
Navteq - Global mapping dbase & technologies - Software
Nayio - Record your music, add video & share - Multimedia
Naymz - Edit & share your own online meta profile - Identity
NBBC - B2B marketplace for video syndication - Video
Ñblog - 2.0 blog - About
Nearbie - Explore or contribute to history of people, places and events - Publish
Near-time - Share resources & collaborate - Productivity
Neato - Tagging plug-in for Wordpress - Tag
Neavetv - Vote for shows this guy has to watch - Video
Nederkaart~ - Refers to map mash-ups (many Dutch) - About
Neighbor - Q&A (local) - Knowledge
Neighboroo - Explore USA trends on map - Geo
Neighborrow - Borrow from, lend to or trade with neighbours, friends & strangers - Economy
Nelements - Take notes in 3D - Office
Nellymoser - Mobile content delivery solutions - Software
Nenest - Create forms & dbases without programming - Software
Neobinaries - Web 2.0 developers, users & experts - Community
Neokast - Live video streaming platform & network - Video
Neoows - Tag, comment, share & discuss news - Community
Neptune - Manage tasks - Office
Nestoria - Property search - Ecommerce
Netcipia - Blog & wiki hosting - Publish
Netcocktail - Share colour schemes - Design
Nethaggler** - Track & negotiate prices - Ecommerce
Netlog - Publish & share photos, blogs etc & make new friends - Community
Netlog - Publish & share photos, blogs etc & make new friends - Community
Netmeshlid - Manage your online digital identity - Identity
Netnewswire - RSS reader (OS X) - RSS
Netomat - Share profiles, blogs, photos, etc - Community
Netscape - Edited & dug news - Rate
Netsquared - Share stories on remixing the web - Publish
Netsuite** - Manage all your business in one integrated suite - Productivity
Netvibes***** - Personal portal - Startpage
Netvouz - Social bookmarking - Bookmark
Networkltd - Share research - Knowledge
Networthiq - Track, share & compare your net worth - Finance
Neurosky - Bionic interface technology - Design
Nevow - Python web app construction kit - Software
Newradio - Find & vote for news - News
Newroo - Memetracker (Stealth) - Search
Newsalloy - Discover, read & share news - News
Newsaloud - RSS2voice - RSS
Newsatseven - Get your customized video news cast - News
Newscloud - Digg news - Rate
Newser* - Algorithm-based news aggregator - News
Newsfire - RSS reader (OS X) - RSS
Newsfutures - Trade on tomorrow's news today - Gamble
Newsgarbage - Post, moderate & control news - News
Newsgator - RSS reader (web & mobile) - RSS
Newshutch - Feedreader - News
Newsisfree - Personalize your news - News
Newskicks - Submit & rate articles for game developers - Rate
Newsletterarchive* - Store & share your newsletters - Communicate
Newslife - RSS reader (OS X) - RSS
Newsmap*** - Rank-interfaced news (who knows what happened to Hives?) - News
Newstoday** - Publish & share cool jobs, gadgets, etc - Community
Newsvine - Read, write & discuss news - News
Newzbubble - Watch your news in bubbles - News
Newzie - Monitor & aggregate news - News
Newzingo - News tag cloud; Google News mash-up - News
Newzpile - Aggregates tags-based feeds from many sources - RSS
Nexbig - Vote for the next big thing - Rate
Nexidia - Transform av data into business intelligence - Software
Neximage - Online imaging - Images
Nexo - Collaboration tools - Productivity
Nextaris - Social search - Search
Nextcat - Platform for entertainment professionals - Economy
NIM - Wireless navigation apps for mobile phones - Geo
Nimbuzz~ - Free mobile community calls, chats, IM - Communicate
Ning - Create social apps - Software
Ninjawords - Dictionary - VAS
Nirbi - Find matches for carpooling - Economy
Nitro - Ruby and JavaScript web app framework - Software
Nivio - Access your desktop from anywhere - Office
Nnseek - Forum search engine - Search
Nnseek - Forum search engine - Search
Nogoodtv* - Uncensored tv - Video
Noisely - Enter your favourite music & get continuous podcasts to your taste - Audio
Nomos~ - Live reporting on sound levels around Amsterdam Airport - Geo
Nonoh - VoiP - Communicate
Nooked - Manage & commercialize your feeds - RSS
Noovo - Create a website & share with other users - Software
Nooz - News for Myspace members - News
Notebookg - Make & share notes - Office
Notecentric - Take notes online - Office
Notefish - Compile & share notes online - Office
Notlong - Shorten your URL - Software
Nottr - Publish & share notes - Office
Novlet - Collaborate on writing - Productivity
Nowlive - Create live, interactive talkshows - Audio
Nownow - Ask a question, get three answers by email - Knowledge
Nowpos - Voice2Email community - Communicate
Nowpublic - Share, submit & revenue share news content - News
Nowsy - Customizable startpage - Startpage
Nowthen - Publish & share mobile pics - Images
Nozbe - Manage tasks - Office
Nsite - Operating system - OS
Numarketing~ (formerly: Keepaddit) - Digg on marketing - Marketing
Numbler - Excel spreadsheet online - Office
Numinalmeme - Share & vote for ideas - Knowledge
Numly - Tag & protect your content with serial numbers (formerly ESBN) - VAS
Numsum - Collaborate online on spreadsheets - Office
Nutclothing - Customize & order your handsprayed T - Ecommerce
Nutrax - Monitor & modify eating habits with your camera phone - VAS
Nutsie - Play your music on your cell - Audio
Nuvutv (formerly: Mediascrape) - Channelled tv - Video
Nuvvo - Build, publish & learn from courses - E-learning

OOO
Obopay - Global mobile transaction solutions - VAS
Octopz - Collaborate on & in any file format - Productivity
Octora - Search & share feed bookmarks - RSS
Octro - Mobile instant messenger - Communicate
Odeo - Record & share audio - Audio
Odesk* - Work as or hire remote workforce - Employment
Odinjobs - Job board for techies - Employment
Odiogo - Convert feeds to speech - RSS
Offermatica - Test & optimize your online marketing - Marketing
Offertrax - RSS-based shopping alerts - Ecommerce
Office-20database - Detailed spreadsheet with online Office-like apps - About
Officezilla - Free collaboration solutions - Productivity
Ogle - Capture, re-use & 3D print 3D data - Personal manufacturing
Ohloh - Search indexed open source projects - Software
Oihoi - First specify category, then search - Search
Okaytoplay - Tools & resources for podcasters & vloggers - About
OK-cancel - Collaboration on interface design - Design
Oks - Digg news - Rate
Omea - Manage & enhance your feeds - RSS
Omgili - Search discussion forums - Search
Omnidrive* - Store & access data - Store
Ondergrond~ - Upload photos of public art - Images
Onedump - Store & share - Store
Onellama - Share your musical tastes & get recommendations - Audio
Onemonkey - Make some money on accepting text link advertising - Marketing
Onerandomsite - Add & share links & surf at random - Bookmark
Onesens - Send teasing webmail messages - Communicate
Onestatement - Track your expenses - Finance
Onetruemedia - Mix & share videos, photos & music - Multimedia
Ongopongo - Search, create or submit & share maps - Geo
Onlinebookmarkmanager - Social bookmarking - Bookmark
Onlinegroups - Create a site, a group, invite & collaborate - Productivity
Onlinephototool - Photo editor - Images
Onlinewritingjobs - Gig directory for freelance writers - Economy
Only2clicks - Speed-dial startpage - Startpage
Onlywire - Social bookmarking aggregator - Bookmark
Onmycity - Upload, post & share everything locally - Community
Onnetworks - Watch & contribute to online how to-tv channels - Video
Ononemap - Find housing (map mash-up) (UK) - Geo
Onsofts - Ebay & Amazon combined shopping search - Ecommerce
Ontoworld - Semantic web wiki-community - Community
Onxiam - Aggregate your digital personae & find similar meta-profiles - Identity
Oodle - Find local classifieds - Search
Ookles - Upload & share photos - Images
Oolsi - Share links to free things - Economy
Ooma - Free phone calls over landlines - Communicate
Oomia - Lost & found - Economy
Oondi~ - Publish & share your text - Publish
Oovoo - Talk face-to-face over the web - Communicate
Oozm - Search refined by people - Search
Openacs - Content management system - Software
Openarchiteturenetwork - Share, review & collaborate on architectural projects - Community
Opencms - Content management system - Software
Opendiary - Publish your blog - Publish
Openfire - Enterprise VoiP and chat solutions - Software
Openid - Distributed identity system - Identity
Openinhoud~ - Share links to and reviews of open source software - List
Openkapow - Mash-up editor & hosting - Software
Openlayers - Put a dynamic map on any web page - Software
Openmedianetwork - Multimedia epg - Multimedia
Openomy - Upload your files & use extra apps - Store
Openpeople - Invite your friends & explore your network - Community
Openrico - Open source Java library - Software
Openstreetmap - View, edit & use geographical data - Geo
Openstudio - Create, collaborate, share, buy & sell - Economy
Openteams - Collaboration tools - Productivity
Openvlog - Upload & record video - Video
Openwave - Adaptive mobile suite for content, communications and context solutions - Software
Openwengo - Make free PC to PC video and voice calls over IP & communicate with your IM contacts - Communicate
Operator11 - Create, edit, remix, view & share videos - Video
Opinionaggregator - Q&A - Knowledge
Opinity - Manage your reputation - Community
Opinmind - Connect opinions to people (bloggers) - Search
Opmlicons - OPML Icon project - RSS
Opmlloader - OPML reader Web based - RSS
Opmlmmanager - OPML reader Web based - RSS
OPMLsearch - Dedicated OPML search - Search
Opmlsurfer - Read OPML Web based - RSS
Opmlvalidator - OPML validator - RSS
Opmlworkstation - Edit, manage, convert & share OPML + PPT2OPML - RSS
Opmom - Community for mothers - Community
Opod - Ajax OPML & RSS widget - RSS
Opsdo - Meta search - Search
Opsource - SaaS enablement and delivery platform - Software
Optevi - Get feeds & contextually relevant related news, blogs & discussion pages - News
Optimal - OPML widget - RSS
Opuzzvoice - Make money on doing voice overs - Economy
Orangoo - Spelling checker - Office
Orb - Stream your media, wherever - Multimedia
Orbeon - Create Ajax forms - Software
Orbitfiles - Store, access & share files - Store
Orca - Online personal desktop - OS
Orcaa - Move your desktop to a homepage - OS
Orchestrate - Task manager - Productivity
Organizedwisdom - Publish & share your wisdom on health matters - Knowledge
Orgasms2~ - Share creativity & inspiration - Community
Orgoo - All your communications integrated in one dashboard - Communicate
Orkut - Connect to your friends - Community
Oryanoo - Virtual office & CRM suite - CRM
Osviews - Submit & rate technology - Rate
Oszone - Share code - Software
Otavo - Collaborative web search - Search
Ourchart - Community for lesbians - Community
Ourmedia - Store & share data - Store
Ourstockworks - Upload, sell or buy stockphotos - Ecommerce
Ourstory - Tell & share the story of your life - Publish
Outfoxed - Social search - Search
Outorin - Gated community - Community
Ownskin - Create, explore & share mobile themes - Multimedia
Ownyourc* - Get help in making choices - Knowledge
Oyax - Social bookmarking - Bookmark
Oyco - Meta communications toolkit - Communicate
Oyogi - Share Q&A - Knowledge
Oz - Mobile IM, email & social networking solutions - Software
Ozmozr - Import, store, share & manage feeds in bulk or individually - RSS

PPP
Packagemapper - Track your package on a map - Geo
Pagebites - Resume search - Employment
Pagebull - Visual search - Search
Pagecharts - Compare Alexa scores of up to 5 websites - About
Pageflakes - Personal portal - Startpage
Paguna - Travel booking with 1 page Ajax interface - Ecommerce
Paird - Social matchmaking - Date
Pairup - Find & connect to fellow travellers - Community
Palary - Ajax browser - Browse
Paltalk - Videochat for social networks - Communicate
Pandafile - Store & send - Store
Pandion - Instant messenger (Jabber client) - Communicate
Pando* - Store & share data - Store
Pandora*** - Personalized radio - Audio
Pandorafm - Mash-up of Pandora & Last.FM - Audio
Panjea - Upload & share content, and get paid for it - Multimedia
Panoramio - Store your geo-tagged photos on Google maps - Geo
Panthius - CRM solution - CRM
Papla - Instant messenger (also mobile) - Communicate
Papoo - Content management system - Software
Parakey - Web OS - OS
Parbet - Betting exchange - Gamble
Parlano - Group dialogue & document sharing - Productivity
Particls - RSS reader (Windows) - RSS
Partypoker - Poker tournaments - Gamble
Partystrands* - Let partygoers interact with you & each other IRL, mobile & online - Community
Partysync - Meet & sms people - Community
Partyvibes~ - Publish & share parties in Holland - Geo
Pastehere - Copy-paste whatever & publish it - Publish
Pawspot - Exchange pet care - Economy
Payperpost - Buy a buzz in the bloggosphere - Marketing
Payplayfm - Music download store - Audio
Payscale - Get & share salary information - Employment
Paystage - Manage your projects - Productivity
Payter~ - Pay with your mobile phone - VAS
Payu2blog - Make money on writing reviews - Economy
Pbase - Host & share photos - Images
Pbwiki - Make a wiki - Publish
Pcastbaby - Store & share podcasts - Store
Pearbudget - Create your budget, track your expenses - Finance
Peasy - Exploit or book & rent parking space (UK) - Ecommerce
Pebblepad - Manage your documents - Software
Peekaboom - Label images in a game - Economy
Peekamo - Peekamo - Mobile community - Communicate
Peekface - Review employers - Employment
Peekkochat - Make every site a 'place' (Firefox plug-in) - Communicate
Peekyou - Editable white pages people finder - Identity
Peepel* - In-browser office apps - Office
Peerflix - List & trade DVDs - Ecommerce
Peerimpact - Swap video P2P and get paid - Video
Peerplink - Digg Web 2.0 websites (password protected) - About
Peerprofile - Publish & share your profiles - Community
Peertrainer - Buddy up, slim down - Community
Peetscom - Treemap product comparison - Data
Pegasusnews - Neighbourhood news, customized - News
People2pray - Manage & share prayer requests - Productivity
Peopleaggregator - Create or join networks, build & connect your community - Community
Peoplefeeds - Aggregate personal content - RSS
Peopleized - Get interviewed & promoted by other users - Marketing
Peoplejam - Get a better career, relationships, health, life by networking - Community
Peoplet - Plan & manage your career - Employment
Periodictable - Periodic table of the internet - About
Perooz - Mobile content portal - Startpage
Perplexcity - Treasure hunt (ARG) - Game
Personalinfocloud - Blog about ubiquitous content - About
Personalweb - Personalized portal solution (download) - Startpage
Persony - Organize & manage web conferences - Communicate
Perspectives** - Visualizes spatio-temporaly the places we inhabit - Data
Pervwatch - Perv mash-up - Geo
Phanfare - Upload & share photos & videos - Multimedia
Pheap - Content management system - Software
Pheeder - Alert all your friends with 1 phone call - Communicate
Pheedfire - Manage, measure & monetize your feeds - RSS
Pheedo - Make some money on accepting ads in your rss feeds - Marketing
Pheromonetrail - Share places & sites & persons - Geo
Phetch - Image treasure hunt (to help visually impaired people) - Game
Philoi - Social bookmarking - Bookmark
Philter - Flash feed reader - RSS
Phixr - Edit & publish your photos - Images
Phling - Listen to, explore & share music on your mobile - Audio
Phlog~ - Upload & share photos - Images
Phonefeeds - Read your feeds on your phone - RSS
Phonegnome* - Add VoiP to your PSTN, SIPped - Communicate
Phonezoo - Create & share ringtones - Audio
Photoblog - Phlog solution - Publish
Photobloggr - Find tags on name; Flickr mash-up - Images
Photobucket - Create, edit, upload & share photos & videos - Multimedia
Photocrank - Add graphics & caption to your cell cam photos & share them - Images
Photomap - Add photos to locations; multi mash-up - Images
Photorgy - Upload & share photos - Images
Photoshelter - Manage your photos - Images
Photoshelter - Store, share, buy & sell photos - Images
Photostack - Manage images (Ajax) - Images
Photostockplus - Submit & sell your photos - Images
Photosynth*** - Rebuild the world in photos - other users' and your own - Images
Photozook - Submit & rate photos - Rate
Photozou - Upload, share & publish photos & video - Publish
Phpcoder - IDE for PHP programmers - Software
Phpcomasy - Content management system - Software
Php-fusion - Content management system - Software
Phpnuke - Content management system - Software
Phpobjectgenerator - Object-oriented code for PHP apps - Software
Phpopenbiz - PHP framework for data centric business apps - Software
Phprojekt - Organize group activities & document sharing - Productivity
Phpwebsite - Content management system for communities - Software
Phrasr - Add photos to phrases; Flickr mash-up - Game
Phusebox - Community for sophisticated people - Community
Pic2color - Create color palettes from images - Design
Picaboo - Print photo book on demand - Publish
Picasa - Find, edit & share photos - Images
Picfu - Easy pic upload & sharing - Images
Pickdee - Organize & share competitions - Game
Pickle - Upload, explore & share videos & photos - Images
Pickle - Share videos & photos - Multimedia
Pickspal - Bet on sports with friends - Gamble
Pickspal - Compete with friends on sports bets - Game
Pickstation* - Listen to & digg music tracks - Rate
Pickupgame* - Find people locally to play games - Community
Picli - Submit & rate creative stuff - Rate
Picnik - Photo editor - Images
Pico - Search multimedia - Search
Picostation - Create & share your phone cam videos - Software
Picpix - Upload & share photos & videos - Multimedia
Picprizes - Publish & share photos, and win prizes - Images
Picsearch - Meta search on pics - Search
Picture2Life - Edit your photos - Images
Picture2life - Edit pics online - Design
Picturecloud - 360o view on your pics - Images
Picturepush~ - Store & share videos & photos - Multimedia
Picturesandbox - Photo & video search - Search
Piczo - Create & share website - Community
Pidgin - Meta instant messenger - Communicate
Piggy-bank - Semantic web browser (Firefox) - Browse
Pikapet - Create & send a personalized ecard - Communicate
Pikeo - Manage your photos - Images
Pikeo - Store, map, organize & share your photos - Images
Pikifx - Edit your photos - Images
Pimpmefamous - Submit & rate videos - Rate
Pinger - Instant voice messaging - Communicate
Pingerati - Share your microformats - Software
Pingidentity - Identity authentication solutions - Identity
Pingoat - RSS ping tool - RSS
Pingomatic - RSS ping tool - RSS
Ping-service~ - RSS ping tool - RSS
Pinppl - PIN messaging for Blackberry users - Communicate
Pipeline - Track your deals & organize your team - Marketing
Pipelinedeals - CRM & sales solution - CRM
Pipl - Search for people - Search
Pivot - Content management system for blogs - Software
Pixagogo - Upload, manage & share photos - Images
Pixelgroovy - Submit & rate tutorials - Rate
Pixelgroup - Draw anything with others - Design
Pixelmator - Photo editor - Images
Pixelmo - Digg games - Rate
Pixelnews - RSS reader (OS X) - RSS
Pixelotto - Click ads & win $ 1,000,000 - Marketing
Pixelperfect - Search stock images - Search
Pixenate - Photo editor - Images
Pixerus - Edit your photos online - Images
Pixilis - Upload & share or sell media - Multimedia
Pixilive - Upload, store & manage videos - Store
Pixpix - Bookmark & share media - Bookmark
Pixpo - Broadcast your video site - Video
Pixpulse - Upload & share photos and videos on your mobile - Multimedia
Pixrat - Social photo bookmarking - Bookmark
Pixsense - Take, manage & share cell phone pics & videos - Publish
Pixsy - Ajax-based image search - Search
Place4langs - Find people to practice or teach languages - Employment
Placeopedia - Wiki + Google maps mash-up - Geo
Placesite - Wi-fi portal & location communities - Community
Placestodo - Post & share places & things - Geo
Planedo - Post stories or vote for them - Publish
Planetminibox - Let your site visitors chat with you & each other - Communicate
Planhq - Collaborate on business plans - Productivity
Planiglobe - Create your own map - Geo
Planix - Organize & manage projects - Productivity
Planypus - Plan events with your friends - Office
Planzo - Arrange meetings & events online & thru sms - Office
Plateau* - Enterprise e-learning, performance & career management solution - E-learning
Platial - Co-create atlas & share places - Geo
Plaxo - Contact synchronizer - Office
Playdo* - Gaming community - Community
Playful-bent - Create erotic stories together - Porn
Playola - Listen to & collaborate on finding similar tunes - Audio
Playtxt - Socialize, flirt thru sms - Community
Plazes*** - Claim & share your locations - Community
Plazesbadge* - Show where you are (e.g. on your blog) - Geo
Plentyoffish - Reallyreallyreally free dating service - Date
Pligg - Includes social tools - Publish
Plime - Submit & rate anything - Rate
Plinkd - Social web hosting - Store
Plinkme - Publish your photos-widget or get photos for free - Images
Plogger - Open source photo gallery system - Software
Plone - Content management system for groups, communities, extranets and intranets - Software
Ploud - Build subscriber lists for RSS marketing - Marketing
Pluck - Social media solutions - Software
Plueballs - Bookmark, rank & share film news - News
Pluggd - Upload & share podcasts - Audio
Plugim - Submit, plug & share content - Economy
Plugoo - Take your IM to any page you want - Communicate
Plum - Collect, share, connect - Community
Plurn - List, listen to, create & share music - Audio
Plusmo - Fast, customizable way to get the web on your phone - Startpage
Pmachine - CMS - Publish
Pobb - Personal portal - Startpage
Pocketfuzz - Create & sell your own ringtones - Audio
Podango - Create a podcast station - Audio
Podbasket - Converts audio into feeds - RSS
Podbean - Upload & share podcasts - Audio
Podbop - Listen to bands that visit your city (Eventful mash-up) - Audio
Podbridge - Metrics for usage of podcasts - Marketing
Podcastalley - Digg podcasts - Rate
Podcastdirectory - Search podcasts - Search
Podcasterbater - Get your porn audio & video podcasts - Porn
Podcastfm - Publish pod & vod casts - Multimedia
Podcastnet - Search podcasts - Search
Podcastpeople - Publish your own multimedia show & make money on it - Publish
Podcastpickle - Share podcasts & vidcasts - Multimedia
Podcastsearchservice - Find podcasts - Search
Podcastspot - Free or premium podcast hosting - Store
Poddater - Create vodcast & connect - Community
Poderator - Store podcasts & create XML - RSS
Podesk - Publish & promote your vodcast - Video
Podfeed - Explore, review, create & share podcasts - Audio
Podfeet - Find casts - Search
Podlinez - Explore podcasts on your cell - Audio
Podnova - Find podcasts - Search
Podolicious - Personalized podcast news - News
Podomatic - Create, find & broadcast podcasts - Audio
Podsafeaudio - Upload & share your music casts - Audio
Podscope - Voice rec-based audio and video search engine - Search
Podscope - Find podcasts thru text search - Search
Pod-serve - Explore, publish & share podcasts - Store
Podshow - Podcast & vodcast network - Multimedia
Podtrac - Advertise in podcasts - Marketing
Pointment - Zaplet 2.006 for scheduling appointments - Office
Pokerlistings - Review, rate & rank poker websites - Gamble
Polarrose*** - Help to make the visual web searchable (stealth) - Images
Polldaddy - Create & publish polls - Survey
Pollgenius - Conduct polls - Survey
Pollground - Publish & participate in surveys - Survey
Polloo - Polls about happiness - Survey
Pollplaza~ - Collective polling - Survey
Pollpub - Create & share polls & contests - Survey
Poly9freeearth - 3D globe with various map layers - Geo
Ponyfish - Create feeds from any website - RSS
Pooln - Schedule your car pooling - Community
Pooxi - Upload & (revenue) share video - Video
Popcast - View & broadcast tv over ip (player) - Video
Poperti - Save your mp3 on a pop email account - Audio
Poperti - Enjoy music (and more) from your Gmail inbox - Multimedia
Popfly* - Create & share pages & mash-ups - Publish
Popist* - Social networking - Community
Populationone - Your pixel and 6.5 billion other ones - Economy
Popuri - Check popularity of any site - Data
Popurls - Folksonomied news - News
Porchlight - Bug tracking for small teams - Software
Pornalicious - Social porn bookmarking - Porn
Pornotube - A disgrace for the porn industry - Porn
Portableplaylist - List & listen to your sounds, anywhere - Audio
Portbooker - Search & book mooring, globally - Geo
Poserfish - P2P betting, free - Gamble
Post282 - Create community blogs - Publish
Postcastsender - Upload, share & get alerts for podcasts - Audio
Postful - Webmail2snailmail - Communicate
Postgenomic* - Share & rank life science knowledge - Knowledge
Posticky - Place, access & share notes (also mobile) - Office
Postr - Post bookmarks to many services - Bookmark
Postreach - Get your posting shadow-published on subject-relevant other blogs - Publish
Postsecret* - Publish & share secrets - Community
Postsecret* - Share your secrets thru sending in postcards - Publish
Postyourbeaver - Publish & share your nude photos - Porn
Powehousemuseum - Contribute to museum object folksonomy - Data
Powermap - Next level Google maps - Geo
Pptexchange - Create, edit & share your presentations - Office
Pptshare - Create, reduce size, organize & share presentations - Office
Praseus - Page rank based search - Search
Predixis - Discover, manage & enjoy music - Audio
Preezo - Compile & share presentations - Office
Prefound - Search & share what you've found - Search
Preloadr - Edit your photos - Images
Presentationengine - Create, edit & share your presentations - Office
Presto - Send email & photos to people who don't have a computer - Publish
Preventionweb - UN disaster risk reduction community. Looking for an experienced Web application developer (PHP, SOAP) who is not afraid of open APIs and CSS. This is a chance to get in on a start-up project and build a system from scratch; cf. https://www.xing.com/app/forum?op=showarticles&id=3441367&articleid=3441367. - Community
Previewseek*** - Byebye Google? (Coming back soon) - Search
Prezentit - Create, edit & share your presentations - Office
Pricenoia - Amazon price comparison - Ecommerce
Pricheck - Check prices continuously - Ecommerce
Primomailer - CMS for email newsletters - Marketing
Printeranywhere*** - Use your friends' printers - Office
Prismastar - Ecommerce solutions - Software
Prisonerlife - Prisoners community - Community
Processing - Share code for imaging, animations, sound - Software
Productwiki - Collaborative product info resource - Publish
Profcast - Record & publish your presentation - Office
Professionalontheweb - Submit & share your (company's) profile & portfolio - Employment
Profil3 - Get to know the people you play with - Community
Profilactic - Aggregate your digital profiles, content & friends - Identity
Profilefly - Aggregate & share your online profiles, contacts & bookmarks - Identity
Profilelinker* - Bring in all your profiles here - Community
Profileomat - Profile aggregator - Identity
Profy - Blog on Web 2.0 companies - About
Programmableweb** - Web 2.0 reference website, main source on APIs and mash-ups - About
Programmermeetdesigner* - Partner matching for IT projects - Economy
Project360 - Organize your projects on the web or on your pda - Productivity
Project4hire - Pitch for a freelance job - Employment
Projectip - Recognizes anything on your computer - Software
Projectopus - Publish, share or sell music - Audio
Projectpipe - Organize & manage projects - Productivity
Projectplace - Run & co-ordinate projects - Productivity
Projectplaylist - Publish & share music playlists - Audio
Projectspace* - Organize, manage & collaborate on your projects - Productivity
Projectspaces - Work together - Productivity
Projity - Organize & manage projects - Productivity
Promptu - Voice based search for all media - Software
Propaganda - Create & edit podcasts (client) - Software
Propelr - Manage tasks - Office
Properazzi* - Promote or explore European real estate - Ecommerce
Propsmart - Find housing (map mash-up) - Geo
Prosper - P2P lending - Economy
Prospero - White label community software - Software
Protectmyphotos - Back-up your photos online - Store
Proteus - Meta instant messenger (Mac) - Communicate
Proto - Create desktop mash-ups - Software
Protolize - Digg web tools - Rate
Protonotes - Make & share notes - Office
Protopage - Personal portal - Startpage
Prototype - JS framework - Software
Protus - Enterprise communication solutions - Communicate
Proworkflow - Manage your projects & time - Productivity
Proz* - Global collaboration platform for translators - Office
Prweb - Push press content to over 100,000 media - News
PSFK - Share trends watched - Marketing
PSI - Check your installed software for malware & updates - software
Psiim - Instant messenger - Communicate
Psiphon* - Surf the web anonymously - Browse
Pssdir - Create & publish your own search engine or web directory - Search
Pubet - P2P filesharing (client) - Software
Publicloos - Share public toilets - Geo
Publish - Create feed from anywhere - RSS
Publishing2** - Web 2.0 from a publishing & marketing point of view - About
Pubsub - Search + profiled alerts - Search
Pulverati - Create & share RSS feed search - Search
Purevideo - RSS startpage for videos - Video
Purevolume - Music community - Audio
Pushcrm - Web-based crm - CRM
Pushy*~ - Personal portal; also mobile - Startpage
Putfile - Upload, rate, share & discuss multimedia - Multimedia
Putfwd - Store & exchange data - Store
Putplace - Organize & share all your offline & online content - Productivity
Puzzr - Vertical search - Search
Pxn8 - Manipulate & publish your photos - Images
Pylons - Web framework using Ruby, Python & Pearl for rapid development - Software
Pytagor - Online desktop & collaboration tools - Startpage

Update 070527, 070831.

Web 2.0 alphabetical: from Qads to Systemone

Italic = new to this index.

QQQ
Qads - Make some money on accepting ads on your blog or website - Marketing
Qcodo - Open source PHP framework - Software
Qelly - Meta search engine - Search
Qipit - Capture & share text with your mobile phone - Office
Qksearch - Meta search for verticals (web, jobs, etc.) - Search
Qliktech - Business performance & intelligence solutions - Software
Qlique - Real-time location aware community - Community
Qlock - Time mash-up - Productivity
Qloud - Social music search & buy service - Ecommerce
Qnalive - Microsoft's Q&A - Knowledge
Qnext* - Share all media & chat about them - Multimedia
Qoogle - Video search - Search
Qoolsqool - Digg school knowledge - Rate
Qoop - Publish & sell photos & photo products - Ecommerce
Qoosa - Social bookmarking - Bookmark
Qooxdoo - Javascript GUI toolkit - Software
Q-phrase - Search solutions (clients) - Search
Qtsaver - Micro content search; Google & Yahoo mash-ups - Search
Qtsearch - Search for content in Yahoo & Google - Search
Quadriot - Digg strange news - Rate
Quantcast - Site stats - Search
Qube - Search engine aggregator (client) - Search
Qucikbrowse - Combine your favourite pages in 1 email - Startpage
Quece - Conversational search - Search
Queeky* - Make drawings online & share them - Images
Queoo - RSS to email, messenger - RSS
Questionform - Create, publish & analyse surveys - Survey
Questionize - Q&A - Knowledge
Questionville - Q&A - Knowledge
Questsin - Collaborate on dictionary - Publish
Quickbase - Project management solution - Productivity
Quickcamp - Organize your projects - Productivity
Quickeo - Store & share your files - Store
Quickim - Mobile instant messenger (wi-fi) - Communicate
Quickmail - Email2RSS - Communicate
Quickmuse - Battle of the poets - Office
Quicknews - RSS reader (mobile) - RSS
Quickref - Search code - Software
Quicksharing - Store & share - Store
Quicksub - Meta RSS button - RSS
Quicktoons - Create & share comics - Publish
Quicktopic - Group message board - Communicate
Quikmaps - Doodle on & share maps - Geo
Quimble - Create, vote for & search polls - Survey
Quintura - Search strange site names - Search
Quizilla - Create & share content - Multimedia
Quizlet - Capture it, submit it, get back a pdf & share it - Office
Qumana - Edit your blog - Publish
Qunu - Get or offer help - Economy
Quomon - Q&A for IT issues - Knowledge
Qvey - Create & pay or participate & get paid for surveys - Survey
Qwer - List & share your things to do - List
Qwerky - Blog on funny & strange 2.0 domain & brand names - Fun
Qwika - Search wikis - Search
Qype - Find & recommend best spots in town - Productivity

RRR
Rabble - Create it & share it mobile - Community
Radar - Upload & share photos & videos from your cam phone - Multimedia
Radeo - Compile & share playlists - Audio
Radioblogclub - List & save your favourite tracks - Audio
Radiohandi - Group chat - Communicate
Radiotaleripple - Analyse your podcast's stats - Software
Radiotime - Personalize radio - Audio
Radiusim - Location enhanced messenger service - Communicate
Radrails - Develop Ruby on Rails apps - Software
Railsbase - Application hosting (Ruby-based) - Store
Rainbow9 - Code & test javascript, css and html - Software
Rainmaker - Create a text cloud from any URL or inserted text - Tag
Raisingthem - Publish & share parenting tips - Community
Raketu - Free regional and international calls, VOD, IM, SMS, multi media player, podcasting, slide show & feeds from your PC & mobile - Communicate
Rallypoint - Share knowledge - Knowledge
Rapidfeeds - Publish feeds without tech know-how - RSS
Rapidobject** - 3D print your prototypes & designs - Personal manufacturing
Rapidshare - Store & share - Store
Rapleaf* - Manage your reputation & rate your friends - Identity
Rapspacetv - Rap & hiphop community - Audio
Rasasa~ - RSS-based news alert service - News
Rasterbator - Creates rasterized images - Design
Rateitall - Rate & share opinions on everything - Survey
Ratemydancemoves - Hot-or-not application of Youtube dance videos - Video
Rateordate* - Crowd match, singles event maps, online dating - Date
Rateyourmusic - Music recommendation community - Rate
Rawsugar - Social bookmarking directory & revenue sharing - Economy
Razz - Record & load up audio to your blog - Audio
Rb-apps - Business intelligence solution - Software
Rbloc - Sell, buy & meet auction market place - Marketing
Rbuilder - Explore, customize or build & sell web apps - Software
Reactee - Order a T-shirt that people can respond on by sms - Communicate
Reader2 - List, review & discuss books - List
Readio - Blog2podcast - Audio
Readitswapit - Swap books - Economy
Readme - Exchange info & compare notes on books - Community
Readon* - Have your video captioned for search purposes - Search
Readspeaker - Text2speech app (Spanish) - Communicate
Readwriteweb - Reviews Web 2.0 things - About
Realestatevoices - Submit & rate articles on real estate - Rate
Realitymarkets - Predictive markets contest - Productivity
Realpeoplestuff - Youtube & Craigslist mash-up - Ecommerce
Realtimematrix - Solution to personalize your content for any device - Software
Reardencommerce* - Employee benefit services - VAS
Reblog - Republish your feeds - RSS
Reblogger* - Collect, filter, sort, index & publish feeds - RSS
Rebtel* - Call international at local rates - using your cell phone - Communicate
Recipething - Organize & share your recipes - List
Recommendit - Social bookmarking - Bookmark
Recruit - Job search engine - Employment
Recruiterredbook - Find the right recruiter - Employment
Recruitv - Video recruitment solutions - Employment
Recycledpapergreetings - Submit your poems & images, and get paid if they use it for greeting cards - Economy
Redbet - Betting exchange - Gamble
Reddit - Digg news - Rate
Redditnsfw - Bookmark, rank & share porn links - Porn
Redfin - Find housing (map mash-up) - Geo
Redland - Feed validator - RSS
Redlettr - Tag & comment the bible - Productivity
Redlightcenter - 3D adult community - Community
Redswoosh - Upload & share video, audio & other big files - Multimedia
Redtoucan - Share photos & review products - Ecommerce
Reevoo - Review & buy electronics - Ecommerce
Referralmonitor - Manage word-of-mouth marketing - Marketing
Refilter - Filter your feeds - RSS
Reflexive* - Cocreate & play games - Game
Refurber - DIY community - Community
Regger - Datamine your blog - Data
Regonline - Organize & manage events - Office
Rel8r - Tag, read, search blogs - Productivity
Relate-a-zon - Pathfinder game (mash-up with Amazon) - Game
Relatime - Present & share ideas about time - Office
Relaytor - Group-email messages, files & polls & aggregate all response - Communicate
Relenta - CRM tool set - CRM
Releton - Google + Yahoo + maps & routes - Search
Relevantview - Captures behaviour & opinions - Survey
Relive - Geotag your mobile cam photos, then relive & share your trip - Images
Rememberthemilk - Manage tasks - Office
Reminderfeed - Send reminders to your feed reader - Office
Remix - Remix & share videos - Video
Remotecontrolmail* - Go thru your snail mail digitally before you receive it - VAS
Rendezvoo - Digg what you like, pay for premium placement - Rate
Renkoo - Arrange when & where to meet your friends - Community
Renkoo - Arrange when & where to meet your friends - Community
Rentacoder - Pitch for a coding job - Employment
Rentmeavacation - Share your vacation homes - Ecommerce
Rentxista - Rent