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.