1 - 9, A - B; Updated

Italic = new to this list.

1001 - Flickr update service - Images
1000tags - Tag cloud based search - Search
123businesscards - Design & print your business cards on demand - Software
1millionsentencesxista - Buy a sentence and increase traffic - Marketing
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
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 - Software
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
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
4shared - Upload & share files - Organize
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
8by1 - Share your wish - List
97tags - Own a tag exclusively - Tag
9cays - Group email2web - Communicate
9minutesoffame - Submit your blog & get 9 minutes exposure - Marketing
9rules - Validate & share links to content - 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
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
Activeallowance - Kids & parents manage kids' allowances - Finance
Activecollab - Collaboration & project management tool (free) - Software
Adaction - Search me - Search
Adahead - Marketplace for advertisers & affiliates - Marketing
Adaptiveblue - Collect & manage favourite things - List
Addictingclips - Upload, watch & share multimedia - Multimedia
Addthis - Collect 'all' information with one button - Bookmark
Adgenta - Add ads to your site, blog or rss feed - Ecommerce
Adgridnetwork - Ad exchange - Marketing
Admob - Buy or sell mobile advertising - Marketing
Adoppt - Publish & share - Community
Adultswim - Episode previews, games, community - Video
Aduna~ - Visualize search results - Search
Adveracious - Digg advertising news - Rate
Advisorgarage - Connects entrepreneurs to advisors - Economy
Aegeetv~ - Create & share video (for European students) - Video
Aftervote - Meta search inc several rankings - Search
Agester - Let other users tell how old you look - Community
Aggregateknowledge - Recommendation engine - Collaborate
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
Airset - Manage & share calendars, contacts, groups - Organize
Airtroductions - 8 miles high dating - Date
Ajax - Mozilla developer community - Software
Ajaxian** - Ajax blog - About
Ajaxilicious - Share your movies thru RSS - Video
Ajaxload - Generates animated Ajax load gifs - Software
Ajaxpaterns - Ajax developers portal - Software
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
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
Allconsuming - List & share everything you like - List
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
Allthingsweb2 - Extensive list of Web 2.0 companies, based on my first listings - About
Allyoucanupload - Image storage - Store
Allyourwords - Associate & share words with links - Bookmark
Almondrocks - Share feeds - RSS
Alpinaut - Search route maps - Search
Altsearch - Categorized list of Web 2.0 companies that are also in THIS list - About
Amateurillustrator - Publish, rate & rank illustrations - Community
Amazon* - Shop, sell, review & rank - Ecommerce
AmazonEC2 - Provides resizable computing capacity - 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 - Market place for original music - Audio
Amiglia - Publish & share family trees, photos, maps… - Community
Amigo - Matches advertisers with email newsletters - Marketing
Amigofish - Rate, recommend & share podcasts - Audio
Amvona - Publish, manage & share your photos - Images
Ándale - Small online business sales tools - Ecommerce
Aniboom - Create, upload, rate & rank animation movies - Video
Annologger - Publish & share announcements - Publish
Annotea - Create & share metadata - Knowledge
Anobii - Publish, share & discover booklists - List
Anoox - Majority vote optimized search - Search
Anothr - Manage & read feeds in Skype messenger - RSS
Answers - Best answers to your questions - Knowledge
Apartmentratings - Rent after reading tenant's review & rating - Ecommerce
Apollo - Adobe RIA development platform - Software
Applian - Capture streaming audio & video - Software
Approver - Share & work on documents online - Office
Arcaplay - Rate & share games - Game
Artfaceoff - Strives to emulate natural intelligence thru accumulated experience - Rate
Askalexia - Ajax interface to Alexia.com - Search
Askeet - Ask & answer it - Knowledge
Askitonline - Create & conduct online surveys - Survey
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 - Collaborate
Associatedcontent - Produce & publish content, get paid - Economy
Asterisk* - Open source phone system (free) - Software
Ataja - Shorten your url - Software
Atiki - Tag based feed search - RSS
Atlarge - Read & write about web access at airports - Wi-fi
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
Audiosnacks - Create, share & download audio travel tours - Audio
Audiri - Recommend & share your media - Multimedia
Autospies - Digg cars - News
Averageshoveler - Game & RSS news mash-up - Game
Avidbeauty - Share photos & sounds - Multimedia
Avvenu - Remote access to your computer - Office
Avvo - Something legal (stealth) - VAS
Aytozon - Comparison shopping from Amazon & Ebay - Ecommerce
Aytozon - Ebay + Amazon metasearch - Search
Azareus - Distribute bandwidth & share content - Software

B2evolution - Blog solution - Publish
Babble - Word game community - Game
Backbase* - Ajax applications - Software
Backfence - Publish & share community news - Rate
Backflip - Social bookmarking - Bookmark
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
Bagbooroworsteal - Get a handbag each month for a few bucks & let it circulate - Economy
Ballbug - Memeorandum for baseball - News
Barablu - Free or cheap calls, IM, chat etc. thru mobile & web - Communicate
Barcamp - Ongoing interactive event - Collaborate
Barcardz - Network in real life - Community
Basecamp - Manage your projects - Organize
Bashr - Wikipedia, Flickr & Delicious mash-up - Search
Battleout - Challenge & vote for best, biggest etc. whatever - Community
Bbpress - Publish & manage your forum - Communicate
Beamfile - Email big files - Office
Beanrocket - News reader - RSS
Bebo - Find back school & college friends - Community
Bebop - Compare music calendar against your iTunes catalogue - Audio
Become - Collective shopping search - Search
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
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
Bibli - Publish & share texts - Publish
Bibliochat - Get book excerpts and reviews, and discuss books - live - Community
Bibliophil - List your books & share - List
Bibsonomy - Share bookmarks & literature lists - List
Bibster - Search, share & manage bibliographic metadata - Search
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
Biggerboat - Search entertainment - Search
Biginjapan - Social media tools - Software
Bigoven - Publish & share recipes - Publish
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
Bioteams* - Blog on team dynamics & virtual collaboration - About
Birthdayforever - Manage & share your wishlist & photos - List
Bitbomb - Web2SMSs reminders - Office
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
Bitwine - Get or give video advice for a price - Knowledge
Bix* - Create & vote for content, and win - Multimedia
Bixee - Job finder - Employment
Biznik - Business network - Community
Blabb - Social bookmarking - Bookmark
Blackplanet - Community for African-Americans - Community
Blast - Promote your site for free - Marketing
Blastfeed - Only get the feeds that matter to you - RSS
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
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
Blogabond - Publish your travel blog (map mash-up) - Publish
Blogbar - Searches your blog and the web - Search
Blogbeat - Compare websites' Alexa rankings (formerly known as Alexaholic) - Data
Blogbridge - Feed reader - RSS
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 - Search blogs - Search
Blogelo - Rate & share websites - Bookmark
Blogexpress - Feed reader - RSS
Bloggerkit - Let Amazon exploit your blog - Ecommerce
Bloggersnap - Add your webcam snapshot to any blog - Publish
Bloggoggle - Categorize & rate pro bloggers - List
Bloginfluence - Let your art compete with other artists' submissions - Rate
Blogladder - Create & maintain your blog - Publish
Bloglebrity - Compute your blog's influence - Fun
Bloglet - Blog update notifications thru email - Publish
Bloglines - Feed reader - RSS
Blogmailr - Use email to send blogposts - Publish
Blogmarks - Social bookmarking - Bookmark
Blogmemes - Vote for & share memes - Rate
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
Blogrovr - Get links to context relevant blog articles while you're browsing - Search
Blogs - Notification2email - Publish
Blogscope - Blog analytics software - Data
Blogsitter - Find (or offer yourself as) a blog co-publisher - Publish
Blogspirit - Blog solution - Publish
Blogstickr - Add fake stickers to your blog - Fun
Blogtalkradio - Host your own phone-in talkradio show online - Audio
Blogtelevision - Search videos in blogosphere - Video
Blogtronix - Blogging & corporate community software - Community
Bloodee - Digg horror - Rate
Bloqr - Publish & share blogs & media - Publish
Blotter - Graph your blog's popularity - Software
Bloxor - Maintain & use your blogroll online - Publish
Blubbry - Publish, share or listen to podcasts - Audio
Bluechipexpert - Profile yourself, invite friends & recruit other professionals, and get paid - Employment
Bluedot - Social bookmarking - Bookmark
Bluedot (formerly: Blue) - Find & share - Search
Bluegrind - Have your personal news anchor reading the news to you - News
Bluepuddle - Create & enrich maps - Geo
Bluepulse - Internet 2 cell phone - Software
Bluesmiley - Manage your online life - Office
Bluetie - Collaborative Office-like toolkit - Collaborate
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
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
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
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
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
Boxed* - Build calendars out of all sorts of online sources - Office
Boxxet - Personalize your incoming content - Startpage
Bozpage - Web 2.0 sources - About
Brainkeeper - Capture, distribute & collaborate on corporate knowledge - Knowledge
Brainreactions - Participate in brainstorms & share ideas - Knowledge
Brandgossip*~ - Find what people say about your brand - Search
Brands2.0 - Traditional brands in 2.0 design style - Fun
Breakinglocals - Local artists and fans community - Audio
Brickfish* - Submit, vote for & review content, and get rewarded for it - Publish
Brightcove - Syndicate & get videos for your website - Video
Britepic* - Add extra content & intelligence to your online pics - Images
Britney - Recommend, publish & digg next big hits - Rate
Broadbandgenie - Find best provider - Ecommerce
Broadbandsports - Upload & share sports videos - Video
Broadramp - Multimedia management solutions - Software
Broadsnatch - Share multimedia - Multimedia
Brokenotbeat - Donate to a needy person each day - Economy
Browse3D - 3D web browser - Browse
Browsershots - View thumbs of your website in all browsers - Design
Browsr - Social directory - Startpage
Browster - Search & browse instantly - Search
Browzar - Surf anonymously - Browse
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
Budgettracker - Track your finances - Finance
Builtsmarter - Modular site (re)construction software - Software
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
Businesssoftware - Article on running a business on Web 2.0-based software - About
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
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
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
Buzzwordhell - Rate & condemn - Fun
Byoms - Personalized IM search agents on your cell - Search

Updated 070527.

C - E; Updated

Italic = new.

Cafépress - Design, sell, buy - Ecommerce
Cafespot - Social guide to cafes, restaurants, etc - Marketing
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
Canvaspainter - Painter - Images
Capazoo* - Create, publish & share your content - Community
Capitoolvertical - Search VCs & entrepreneurs - Finance
Carbonite - Back up your PC - Store
Carbonmade - Publish & manage your portfolio online - Ecommerce
Care2 - Digg sustainable things - Rate
Careerbuilder - Find jobs yourself or get recommendations - Employment
Caspio - Web-based database solutions - Software
Castingwords - Get your podcasts transcribed - Economy
Castpost - Upload & share your av clips - Multimedia
Catster - Digg cats - Rate
Cchits - Social bookmarking - Bookmark
Ceiva - Host & share photos - Images
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 - Make, upload & share ringtones - Audio
Cellswapper - Swap out or in a mobile phone contract - Economy
Celltell - Send voice notes from your phone - Communicate
Celumimagine - Media management tool - Software
Centraldesktop - Group project management - Organize
Centraldesktop - Web-based collaboration tool - Organize
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
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
Chatcreator* - Create your chat room instantly - Communicate
Chatfu - Cartoonize your chat - Communicate
Chatsum* - Chat with & leave messages same-site-visitors - Communicate
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
Chumby - Always-on wi-fi device to fetch & exchange media & to communicate - Wi-fi
Chuquet* - Find buzzes - Bookmark
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
Citizendium - Wiki with gentle expert moderation - Collaborate
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
Cl1p.net - 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
Clearforestsws - Semantictextanalysis2XML - Data
Clearspace - Enterprise collaboration solution - Software
Cleversafe - Software for dispersed data storage - Store
Click2zap - Remove parts of web page before print out - Software
Clickcaster - Record, license, publish & promote your radio show - Audio
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
Clipfire - Shop search engine & community - Ecommerce
Clipmarks - Social clipping - Bookmark
Clipnabber - Helps you to download videos anywhere - Video
Clipshack - Upload & send video - Video
Clipsync - Watch videos together & chat - Communicate
Clockingit - Project management for SME - Organize
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
Clusty - Cluster results in folders - Search
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
Cogenz - Intra-company social bookmarking - Software
Coghead - Create & share web-based business apps - Software
Cogmap - Create, edit & share org charts - Collaborate
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
Colorblender - Colour picker & matcher - Design
Colorcell - Find beautiful colour combinations - Design
Colorschemer - Explore colour schemes - Design
Colourlovers - View, are & review colour schemes - Design
Colr* - Play with colour photos & publish results - Images
Colrpickr - Colour picker - Design
Comagz - Co-create & rate content - Community
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
Commongate - Create your own social network - Community
Commontimes - Social bookmarking & clippings - Bookmark
Communitywalk - Share places & routes (map mash-up) - Community
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 - Collaborate
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
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
Contentvote - Add voting to your blog content - Survey
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
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 - Organize
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
Corkd - Catalog, rate & review wine - Community
Cosmopod - Your personal desktop - OS
Cottonrape* - Shopping game - Ecommerce
Couchsurfing* - Home swapping & holiday dating - Economy
Covenanteyes - Anti-porn filter for… you - Software
Coverpop - Mash-ups of everything - Ecommerce
Craftster - Share crafting ideas - Community
Craigslist* - Post & read classifieds - Ecommerce
Craigsnumber - Get a temporary, anonymous phone number - Communicate
Crank - Submit & vote for cycling news - News
Cranky - Search & rate in this age relevant senior search engine - Search
Crazyegg - Watch users' click paths as a movie - Data
Creamaid - Spread the word thru your blog & get paid - Marketing
Create-ringtone - Create & send ringtones, wallpapers, videos etc. to your mobile phone - Software
Creatingonline - Design & image editing toolbox - Software
Crickee - Send & receive sms for free - Communicate
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
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
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
Customerforce - Search & share everything - Community
Customervision - Enterprise wiki - Publish
Cuts - Organize the video you paid for - Video
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 - Collaborate
Cyworld - Record, share & give - Community

Dabble - Share, manage & explore your information - Community
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* - 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
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
Daz*~ - Explore, contribute to & share the biggest music dbase - Audio
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
Dealmine - Personalize your best deals - Ecommerce
Dealplumber - Find deals & coupons - Ecommerce
Dealsplus - Share hot deals - Ecommerce
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
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
Desktopize - Widgetize your website - Publish
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
Developerid - Community for web industry - Community
Deviantart - Publish or buy from art portfolios - Community
Devshop - Software project management software - Organize
Devshots - Create a Google-like logo - Fun
Dexly (olim Categoriz) - Categorized list of Web 2.0 companies (heavily depending on Everything 2.0) - About
Diaryland - Publish & share a web diary (a.k.a. Pitas) - Startpage
Dictionary - Write & share anything - Office
Diffbot - Get alerts on websites' changes - Software
Diffbot - Get alerts on web page changes, price changes & news - VAS
Difm - Radio community - Audio
Digforit - Meta search - Search
Digg* - Mash-up news sources to your own taste - News
Diggfiltr - Create custom digg feeds - 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
Digitaljournal - Identify, rank & share interesting news - News
Digitalmagics - Stream your mobile videos over IPTV - Video
Digitalmediasearch - Search media - Search
Diglog - Diggs Chinese Web 2.0 pages - About
Digstock - Digg stock - Finance
Diigo - Social bookmarking on steroids - Bookmark
Dimewise - Manage your finances - Finance
Dine52 - Social bookmarking - Bookmark
Disclosetv - Publish & share conspiracy video stories - Video
Discogs - User-built music database - Audio
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 & links to your podcast - Audio
DIYmap - Create maps in Flash - Geo
Django - Python apps - Software
Dliveo - Send & track email, any size - Office
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
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 - Share JS tools - 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
Dosize - Resize & send your photos - Images
Dotherightthing* - Dig or diss companies - Rate
Dotnetkicks - Digg .net stories - Rate
Dotproject - Open source project management tools - Organize
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
Dpolls - Create, vote for & search polls - Survey
Dreamcrowd - Publish & share dreams, and get them explained - Publish
Dream-recorder - Record YOU while you sleep - Software
Dreamzone* - Create or improve & vote for images - Images
Dropcash - Create & manage online fundraiser - Marketing
Dropsend - Email 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
Dumpr - Fun things for Flickr - About
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
Dvdidle - Work around DVD region codes & css - Software
Dzone - Digg for developers - Rate

E2dolist - Create, manage & share to-do lists - Organize
Earfeeder - Scan your disk for music, and automatically get feeds on your favourite artists - Audio
Easybib - Bibliography composer - List
Easyutil - Api for recommendations - Software
Eatmyhamster - Digg for videos, pics & jokes - Rate
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
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
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
Eefoof - Publish & share media - Multimedia
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
Ekklesia360 - CMS for churches - Publish
Ekoss - Semantic search for engineers - Search
Ekudos~ - Digg Dutch news - News
Ekudoz - Give & receive kudoz - Community
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
Elkhuistekoop~ - Rate & pick your restaurants - Ecommerce
Eloops - Project management solutions - Collaborate
Eluta - Search new jobs (Canadian) - Employment
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
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
Ensiting - Share links with friends - Bookmark
Entriq - Make money on your content - VAS
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
Etelos - Try & buy on demand Web 2.0 apps - Software
Ether - Set up your call centre, make money - Economy
E-tranet - CRM - CRM
Etsy - Buy & sell handmade things - Ecommerce
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
Everything2.0 - Comprehensive list of Web 2.0 companies and websites - About
Everythingweb20search - Web 2.0 search - Search
Evideoshare - Create, publish, share & interact - Video
Evnt - Publish & share RL events - Community
Evoca - Create, manage, share & search voice recordings - Communicate
Evoketv - Localized epg (ajax) - Video
Evolvepoint - Create, track or find feeds - RSS
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
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
Expotv - Videocast reviews & opinions - Video
Expressionengine - Web publishing system - Publish
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
Eyeos - Virtual office operating system - OS
Eyesearch - Search results presented in mini thumbs - Search
Eyespot - Edit & remix videos online - Economy

Update 070527.