T - Z; Update

TTT
Tabblo - Upload, edit, compose & share your photo albums - Images
Tag2find - Tag & find everything on your hard disk - Tag
Tagacloud - Add your domain to cloud & promote both - Marketing
Tagalag - Tag & map your contacts - Community
Tagblitx - One-stop-bookmarking tool - Bookmark
Tagbulb - Meta tag search - Search
Tagcloud - Folksonomied, personalized tag clouds - Tag
Tagcrowd - Processes frequency based "tag" cloud from any text file - Tag
Tagdirectory - Tagged business directory - Marketing
Tagfacts - Tag & share your notes - Tag
Tagfetch - Folksonomy meta tag search - Search
Tagged - Tag yourself and the ones you love - Community
Taggle - Social bookmarking, tagged (German) - Bookmark
Tagground - Search for URLs by tag or v.v. - Search
Taghop - Digg links - Dig
Tagjag - Meta search (formerly Gada.be) - Search
Taglines - News in tags - News
Taglocity - Add tags to all Outlook files - Tag
Tagnautica - Search Flickr - Search
Tagspy - I tag so I am - Tag
Tagsy - Social bookmarking & feed management - Tag
Tagthenet - Text2Tags - Tag
Tagtooga - Social bookmarking - Bookmark
Tagworld - Share music & photos - Multimedia
Tagzania - Share & map places - Geo
Tailrank - Read news (ranking through algorithm) - News
Talkdigger - Search & discuss results from blogs & web - Search
Talkinghub - Add tags to your forum - Tag
Talkr - Convert blog text to podcasts - Publish
Talkshoe - Chat, talk 1:1, host a talkshow - Communicate
Talkster - Mobile2IM for free - Communicate
Talktrust - Call anonymously - Communicate
Tallstreet - Trade search results like stock market - Search
Tanbul - Google-like search, better algorithm for user input - Search
Tantricsoulmateconnection - Matching based on horoscopes etc. - Date
Tapgad - Get & reply to email thru sms - Communicate
Tapoll - Create, manage & predict outcome of polls - Survey
Tapuxmobile* - Mobile fun & community content & apps - Software
Targetedpixel - Buy pixel space for 5 years - Marketing
Targetyournews - Control who sees your news submission - News
Taskfreak - Task manager online - Organize
Taskspro - Group task manager - Organize
Taskthis - Manage, publish & share task lists - Organize
Tasktoy - Create lists, notes & memos - Office
Tastydish - Report, tag & share restaurants - List
Tastydrop - Submit & rate wines - Ecommerce
Teamslide - Collaborate on presentations - Office
Teamspinner - Organize & manage your projects - Organize
Teamworklive - Communicate, collaborate & share information - Collaborate
Techcheatsheets - Share cheats - Bookmark
Techcrunch - 2.0 blog - About
Techcrunch - Comparison of mapping services - About
Techdirt - Share your opinion & get paid for it - Publish
Techmeme - Automated tech news aggregator - News
Technoranki - Rank blogs - Rate
Technorati* - Find what people are saying - Search
Technoratikitchen - Saerch for microformats - Search
Techzingo - Tagged tech news - News
Teleflip - PC2Text - Communicate
Tellfriends - Publish, rate & share things you like - Community
Tello - Locate & collaborate with your key contacts - Communicate
Tempinbox - Receive inmail anonymously - Communicate
Tenbills - Design & buy your T - Ecommerce
Tendango - Top 10 list community - List
Tenhunt - 10 questions, 10 sites, best & fastest wins - Marketing
Terk~ - Meta search for articles - Ecommerce
Terraims - Create & publish your own map markers - Publish
Textamerica - Mobile blog - Publish
Textdrive - Hosted applications - Store
Textmarks - Customize your own sms info service - Communicate
Textorizer - Image2Text - Images
Textpattern - Web publishing system - Publish
Textpayme - Mobile P2P micropayments - PSP
Textsnippets - Share code - Software
Tezaa - Create, modify & participate in polls - Survey
TFD - Personal portal - Portal
Thandora - Tag based search in yellow pages - Ecommerce
The100lists* - Publish & share your lists - List
Theadcloud* - Create & tag classified listings - Marketing
Theadreview - Digg advertizing - Dig
Thebeststuffintheworld - Submit, rank & share the best whatever - Knowledge
Theblackstripe - Upload & share photos - Community
Thebroth - Collaborate & share glob al mosaic - Community
Thedailyplate - Search foods & find healthiest options - Search
Thefind - Shopping search - Search
Theglump - 2.0 blog (French) - About
Theinjuries - Share knowledge & experiences about industrial injuries - Knowledge
Themintpages - Recommend & share reviews on beauty products - Ecommerce
Thenorp - Digg porn links - Dig
Thepool - P2P sports betting - Gamble
Theport - Create & host your own news aggregator - News
Thethingsiwant - Create & share whis lists with photos - List
Theuncensored - Upload, share & rate porn - Porn
Theunseenvideo - Video & weather mash-up animation - Video
Thewsx - Collectively predict Washington politics - Survey
Thinglink - Search, label & share things of interest - Office
Thinglinks - Connect virtual with real world thru sema codes - Tag
Thinkature - Collaborative workspace - Office
Thinkfree - Web-based office suite - Office
Thisnext - Shopping recommendation network - Ecommerce
Thisplaceiknow - Share places - Marketing
Thnlnk - Semantic URL shortener - Software
Thoos - Social networking for athletes - Community
Threadless - Submit & rate T-shirt designs - Ecommerce
Thumblicious - Displays thumbs of most pupular delicious sites - Bookmark
Thumbq - Upload & manage images - Images
Thumbstacks - Make & share presentations online - Office
Tick - Time tracking app for teams - Organize
Tickethappy - Shared CRM management - CRM
Tickle - Lifestyle community - Community
Tickme* - Find someone you like, tick him/her & see if he/she ticks you back - Date
Tickr - Flickr desktop ticker - Images
Tictap - Price comparison for mobile - Ecommerce
Tiddlywiki* - Publish and share notes - Publish
Tiggdo - Personal mobile portal - Portal
Tiktrac - Manage your time - Organize
Tilika - Share calendars - Office
Tiltomo - Search for similar photos - Search
Timeline - Visualize time-based events - Organize
Timetomeet - Share your schedule - Office
Timetracker - Keep track of time - Office
Tinfinger - Search persons - Community
Tinymce - Wysiwyg editor - Publish
TinytinyRSS - Feed reader - RSS
Tioti - Discover, download & discuss tv content - Video
Isporty (olim Tiredandtested) - Sports community - Community
Titantv - Filter out what's on tv - Video
Titlez - Get publishing market data from Amazon - Marketing
Tnook - Build, manage & trade your collections - Ecommerce
Toeat - Map & share restaurants - Geo
Togetherdating - Dating after personal introduction - Date
Toggl - Track time & meetings for teams - Organize
Toodledo - Manage your to-dos - Office
Toolstolife - Change yourself together! - Community
Toongum - Publish & share flash cartoons - Community
Top10webdeveloperlibraries - Annotated top 10 of developer libraries - About
Top25Finance20 - List of FINANCE 2.0 apps & services (peculiar similarities with my list...) - About
Topix - Share & discuss news - News
Topspot-ornot - Spot & review locations (map mash-up) - Geo
Toptaggers* - Tag, rank & share links - Search
Toptensources - Startpage - Search
Topufo - Publish & share encounters of 1st, 2nd & 3d kind - Video
Toread - Social bookmarking - Bookmark
Totoexpress - Hoste, collaborate on, share & deliver content - Multimedia
Touchstone - Suscribe to your news & alerts - RSS
Toufee - Create & publish flash presentations - Images
Tourbus - Find live music - Audio
Tourfilter - Get email alert when your favorite band is in town - Audio
Touristremover - Remove undesired objects & persons from your photos - Images
Towncrossing - Create & participate in communities - Community
Tracbac - Share, comment, revise & collaborate - Knowledge
Trackslife - Manage & share your to do-lists - Office
Traction - Enterprise multi-user blogging - Software
Tractis - Negotiate & sign contract, solve disputes online (stealth) - Legal
Tradebetx - Betting exchange - Gamble
Tradesports - Betting exchange - Gamble
Tradindex - Spread betting exchange - Gamble
Trailfire - Log & share your clickpaths - Community
Traincheck - Get an sms with the next 3 departure times - VAS
Traineo - Share your weight loss with your motivators - VAS
Trashbit - Register & share your code - Economy
Travbuddy - Submit & share travel stories - Publish
Treadr - Track & follow people online - Geo
Treemaptechniques - Comprehensive article - About
Treemo - Post, manage & share media online & mobile - Multimedia
Tree-nation - Plant a tree in Niger - Economy
Treinvizier~ - Actual whereabouts of Dutch trains - Geo
Trendalicious - Real time website popularity trends - Stats
Trendio - Bet on popular news - News
Trexy - Share your clickpaths - Bookmark
Tribe - Connects you to friends, neighborhoods & forums - Community
Tribler~ - Watch, rate & share video - Video
Tripconnect - Publish & share travel advice - Community
Triphub - Plan group trips - Community
Tripmates - Meet locals, get tips - Community
Tripmojo - Map & share hotels - Geo
Triporama - Plan, research & book trips together - Ecommerce
Tripster - Publish, recommend & share travel experiences (stealth) - Publish
Triptie - Mix your trip from trip plans by other users - Community
Trivionomy - Create, edit & play trivia game - Game
True - Dating, free of married people and other criminals - Date
Trueshare - Store, manage & share files - Store
Trumba - Create& share events - Office
Trustedopinion - Social recommendations engine (with visualisation of trusted circle of friends) - Ecommerce
Trustmymail - Spam filter based on your circle of contacts - Communicate
Truveo - Ranked video search - Video
Tubesnow - Create, invite & share - Community
Tudu - List & manage your tasks - Office
Tunecore - Create & sell music - Audio
Tunefeed* - Share your music on any website - Audio
Tunefind - Index of tv and movie music songs - Audio
Tunefind - Submit & find film & tv music - Search
Turboclip - Publish, access, manage & share bookmarks - Bookmark
Turbodbadmin - Online dbase in Ajax - Dbase
Turbogears - Rapid development framework - Software
Turn - Automate your online campaigns - Marketing
Turnhere - Upload & share video (local) - Video
Tutocle - Find, submit & share tutorials - Knowledge
TV - Filter out what's on tv - Video
Tvunetworks - Broadcast or view tv over IP - Video
Twango - Upload & share your media - Multimedia
Twerq* - Remember search results in tabs - Search
Twitter - Update your friends on what you're doing - Publish
Twocrowds - Share your predictions & have them assessed - Knowledge
Twones~ - Share your playlists & make new friends - Audio
Tworl - Chat with strangers - Communicate
Twttr - Share where you are thru your cell phone - Communicate
Txtmob - Share sms messages with your friends - Communicate
Txtsaver - Online notepad - Office
Typetester - Compare screen type - Design
Typolis - Blogging solution - Publish

UUU
Uask - Sell or buy for the price you want - Ecommerce
Uberchannel - Create & share your own channel - Video
Ufeed - Get RSS feeds in your own page - RSS
Uize** - Java API Library - Software
Ujiko** - Visual your search, manipulate results, manage your reputation (by the wizards from Kartoo); the more you use it, the more cool features you get - Search
U-lik - Build your virtual library & share it - Community
Ulinkx - Search, bookmark & share media - Multimedia
Ummyeah - Digg videos & news - Video
Umundo - Upload & share mobile videos and pix - Multimedia
Unalog - Share what you read, in groups - List
Uncutvideo - Aol's You Tube - Video
Unspun - Publish & share your best-of lists - List
Upcoming - Create, manage & share events - Office
Uplayme - Share music & meet people with same taste - Community
Upto11 - Discover & share music - Audio
Upwarded - Upload, rank & share multimedia - Multimedia
Urbandictionary - Contribute to slang dictionary - Vocubalary
Urbanplanet - Discuss urban (USA) issues - Community
Urbis - Community for creative people - Community
Urlex - Leave comments on any website - Bookmark
Urlfan - Real time blog reference search - Search
Urlx - Shorten your URL - Software
Userplane - Chat, messenger, record - Communicate
Userscape - Web-based help desk portal - CRM
Uspot - Upload & share media - Multimedia

VVV
V4s - Add voice to your email - Communicate
Valuewiki - Wiki for securities - Finance
Vanilla - Forum solution - Communicate
Vast - Car search - Search
Vcarious - Travel community - Community
Vcdiggz - Community based deal sourcing firm - Finance
Vcnewscentral - Digg start-up & VC news - Finance
Veeker - Shoot, send & share videos while you travel - Video
Veetro - Create & share online project space - Organize
V-enable - Mobile speech search - Search
Vennt - tag-based forum solution - Communicate
Veoh - Upload & share videos - Video
Veotag - Enrich media files with meta data & share - Multimedia
Verbdate - Speak up before you date - Date
Verisignpip - Personal identity provider - Identity
Veryfunnyads - Submit & vote for funny commercials - Video
Vflyer - Compose classified ads and multi-post them - Marketing
Vfxy - Photoblog syndication community - Images
Vicito - Group text service - Communicate
Viddler - Create, enhance & share your video - Video
Videobomb - Discover, digg & share videos on Democracy Player - Video
Videoegg - Capture, edit & publish video - Video
Videojug - Share know-how thru video - Knowledge
Videoronk - Meta video search - Search
Videosift - Upload, share & digg videos - Video
Videostumble - Link to, rate & share videos - Video
Videws - RSS news mashed up with Youtube videos - Video
Vidilife - Upload & share media - Multimedia
Vidivodo - Profile yourself & share media - Multimedia
Viewr - Publish on map & buy or sell homes, globally - Ecommerce
Viewscore - Product search & comparison engine - Search
Vimeo - Upload & share video - Video
Viralvideochart - Tracks the buzz around videos - Video
Virb - Upload & share multimedia - Multimedia
Virtualcity - Navigate map with help of photos (Toronto) - Geo
Virtualkarma - Web 2.0 list - About
Virtualvideomap - Google Maps & Youtube mash-up - Geo
Virtual-whiteboard - Work, think, design together - Organize
Virtualworldsreview - Lists & reviews virtual worlds - About
Visiblepath - Relationship management tools - CRM
Visualcomplexity - Visualize complexity - Software
Visualthesaurus - Find & visualize synonyms - Vocubalary
Visuarios - Publish & share how-to videos - Knowledge
Vitalist - Organize & share your tasks & projects - Office
Vitalsource - Publish & sell or buy books - Ecommerce
Vitamin - Resource for designers, developers & entrepreneurs - About
Vitamint - Explore & share tips, and get paid - Knowledge
Vitrue - White labeled advertizing video solutions - Software
Vivapop - Share schedules - Office
Vivirama - Put your home on this free international map - Geo
Vivisimo - Clustered search - Search
Vivox - Solutions for communities, communications, games - Software
Vizrea - Upload & share (camera phone) photo content - Images
Vizu - Create, share & vote for polls - Survey
Vlogmap - Map your vlog - Geo
Vmix - Upload & share videos - Video
VNCCasts - Watch live broadcasts of people's computer screens - Video
Vodpod - Publish your videos and/or playlists & share them - Video
Voices - Market place for voice overs - Economy
Voo2do - Organize your tasks - Office
Votemerich - Blog, campaign, vote & get rich - Economy
Voteo - Create, modify & participate in polls - Survey
Vox - Blog & share content - Multimedia
Vsocial - Upload, rank & share video - Video
Vtiger - Open source CRM - CRM
Vurbs - Dig videos - Video
Vyew - Meet, share, discuss & annotate in group sessions - Organize

WWW
W8alth - Get rich or become an investor - Finance
Wablet - Call & chat ID - Identity
Wadgetos - OS in your browser - OS
Wadja - Use & share the web on your mobile phone - Community
Wageexchange - Share your salary - Finance
Wallnote~ - Manage notes & to-do's - Organize
Wallop - Publish & share media - Community
Wampad - Experiments in speed search - Search
Wankr - Collaborative masturbation community - Fun
Warholit - Warholize your pics - Images
Wasabi - Share news with friends - Community
Watchingthewebflyby - Animated logo race - Ecommerce
Watchmedoing - Upload & share mobile videos - Video
Watchmouse~ - Site & server monitoring services - Software
Watchthisnext - Vote for & buy DVDs - Ecommerce
Watson - Add contextual search to all documents - Search
Wattpad - Publish & share stories on your cell phone - Publish
Watvindenwijover~ - Find & vote for information - Search
Waxmail - Add voice to your email - Communicate
Waxxi - Listen to & participate in podcasts - Audio
Wayfaring - Create & share your maps - Geo
Waymarkr - Turn your mobile into a life phlogging wearable - Images
Wayn - Log & share places & people - Community
Waypath - Search blogs - Search
Wazima - Coupon aggregator - Ecommerce
Weatherbonk - Mashes up 10 API's - Geo
Weatherbug - Share video weather casts - Video
Web20alizr - Generate & promote a 2.0 app automatically - Fun
Web20awareness - Check your last visited links to decide how 2.0-aware you are - Fun
Web20bingo - Bingo with 2.0 buzz words - Fun
Web20bullshitgenerator - Generate 2.0 speak - Fun
Web20definition - Summary of updated Web 2.0 definition - About
Web20domainnamegenerator - Find cool 2.0 names - Fun
Web20foreducators - Web 2.0 list - About
Web20generator - Generate a 2.0 web page - Fun
Web20interact - Rate & rank Web 2.0 sites (Icelandic) - About
Web20intheenterprise - List of enterprise solutions - About
Web20manifesto - Lessons for businesses - About
Web20map - Web 2.0 companies on map mash-up - Geo
Web20milliondollarhomepage - Pixel ads - Ecommerce
Web20namegenerator - Generates fancy web 2.0 brand names - Fun
Web20palette - Color palette for Web 2.0 design - Images
Web20principles - Recap of updated 'official' O'Reilly definition of Web 2.0 - About
Web20quiz - Web 2.0 brand or Star Wars character quiz - Fun
Web20show - Podcasts about Web 2.0 companies - About
Web20strategy - Does every organization need one? Great article by Dion Hinchcliffe - About
Web20stylr - Create your web 2.0 logography - Fun
Web20toolbar - Search on, submit to & get alerts from Web 2.0 websites - Portal
Web20validator - Screen your website on 2.0-ishness - Fun
Web2carz - Shop for cars, publish & share reviews of dealers - Ecommerce
Web2journal - Web 2.0 magazine - About
Web2list - Digg 2.0 websites - About
Web2logo - Web 2.0 logos - About
Web2messenger - Send messages from web 2 messenger - Communicate
Web2newswire - Publish, share & digg news - Publish
Web2null - 2.0 blog (German) - About
Web2reddit - List; vote on Web 2.0 companies - About
Web2slides - Slow slideshow of (old version of) THIS list - About
Webaroo - Search the web offline - Search
Webbrush - Collaborative drawing, charting, etc - Design
Webby20 - Thumb 2.0 list - About
Webfalls - Useless link sharing - Fun
Web-feeds - Digg videos & links - Video
Webgoggles - Adult search - Porn
Webgui - CMS - Software
Webimager - Capture screens & upload them to Flickr - Images
Webjam - Collect, mix & share content from many sources - Community
Webjay - Playlist community - Audio
Weblo - Play & earn in world game - Game
Weblogistan~ - Tools that add interaction to your blog - Publish
Webmarketing20 - Wiki on marketing 2.0 - Marketing
Webmorizer - Share notes on websites - Office
Webmunism - Search media & knowledge in self-organizing categories - Search
Webnote - Make & share notes - Office
Weborb - Build, deploy & host rich client apps - Software
Webosphere - 2.0 blog - About
Webride - Add forum to any web page - Communicate
Webringr - Create, send, manage & share links - Bookmark
Webripper - Rip files from sites - Software
Webshots - Upload, share & print photos - Images
Websitesasgraphs - Show your links as a graph - Images
Websitewatcher - Monitor sites for updates and changes - Software
Websnext - Slideshow of Web 2.0 sites - About
Webtop - Social desktop - OS
Webtwopointoh - Create your own 2.0 company - Fun
Webwag - Customize your start page - Portal
Wecheese - Proximity based dating - Date
Weebly - Free web creation tools - Software
Weedshare - Play, buy, share & sell music - Ecommerce
Weekendr - Plan & share weekend activities - Community
Weeworld - Create your avatar & share it everywhere - Community
Wehow - Profile & share your expertise - Knowledge
Wereldkenner~ - Wikipedia & Google Earth mash-up - Geo
Wesabe - Help each other to get the most from your money - Community
Wesmirch - Automated gossip aggregator - News
Wetpaint - Create, contribute & connect - Publish
Whabam - Search, buy & sell - Ecommerce
Whatsbuzzing - Search, browse & discover products with a buzz - Ecommerce
Whatshouldireadnext - Share your bookshelve - List
Whatsweb20 - Shortest list of Web 2.0 companies - About
Where - Upload & share photos on community walls & maps - Community
Whirlpad - Publish & share travel journals - Publish
Whobar - Sign on software - Identity
Who-isit - Whois, ping, check link popularity - Search
Wholinked - Look up who's linking to your site - Stats
Whonu - Discover/search content (more) intuitively - Search
Whototalkto - Job referral exchange - Employment
Whowouldbuythat - Anti-ecommerce - Ecommerce
Whyrobbierocks~** - Style your avatar & travel with it around the world wide web - Community
Widgetbox - Directory for web widgets - Search
Widgetoko - Aggregates social widgets - About
Widgipedia - Digg widgets - Dig
Widsets - Create mobile widgets - Software
Wiffiti* - Text your message to public screens - Communicate
Wifitastic - Set up a commercial wi-fi hotspot - Wi-fi
Wikiafterdark - Create, edit and learn from adult how to articles - Porn
Wikibios* - Let your friends collaborate on your bio - Publish
Wikicalc - Collaborate on data sheets - Office
Wikicompany - Social business directory - Marketing
Wikihow - Collaborate on collection of how-to manuals - Collaborate
Wikimatrix - Compare wikis - About
Wikinancial - Read & share knowledge on stock trading - Finance
Wikio - User managed news search - News
Wikipedia* - Read & co-edit encyclopedia - Publish
Wikipediamobile - Wap version of Wikipedia (by Sevenval) - Publish
Wikispaces - Collaborative content & editing - Publish
Wikitravel - Read & co-edit travel guide - Publish
Wikology - Business directory wiki - Ecommerce
Wildapricot - CMS with lots of 2.0 for not-for-profit clubs etc. - Software
Windowslocallive - Race your own street - Game
Wink - Folksonomied search - Search
Winksite - Create & share mobile content - Multimedia
Wirefan - Social bookmarking & discovery - Bookmark
Wisdomark - Collaborate on publishing & sharing stories - Publish
Wisdomdb - Rate & share solutions to problems - Knowledge
Wishlistr - Create & share wishlists - List
Wishood - Create & share wish lists - List
Wists - Share shopping lists - Ecommerce
Wizag (a.k.a. Diggol) - Track your news & blogs on your own news page - News
Wize - Product review aggregator - Ecommerce
Wizlite - Highlight & share text on any web page - Office
Wobblog - Rank & share blog postings - Rate
Woeba - How to Web 2.0 list - About
Wondir - Share Q&A - Knowledge
Woolygans - Street culture community - Community
Woomp - Upload & share art, photos & video - Multimedia
Woomu - Submit, vote for & rank videos - Video
Wordcast - Host, manage, measure & monetize podcasting - Software
Wordie - Publish and share (lists of) words - Vocabulary
Wordnews - News tagged in Times - News
Wordofblog - Spread the word for good causes - Marketing
Work - Publish & share articles on SME business - Knowledge
Workcircle - Find recruiters or jobs - Employment
Workday - web-based ERP solutions - Software
Workfriendly - Make surfing look like working in Word - Fun
Workmagnet - Search, find & apply for jobs, or recruit - Employment
World66 - Read & co-edit travel guide - Publish
Wridea - Store ideas, manage projects - Organize
Wrike - Plan & organize projects - Organize
Writeboard* - Write, share, revise & compare documents - Office
Writely - Store, edit & share documents - Office
Writetomyblog - Multi blog word processor - Publish
Wsfinder - Search APIs and web services - About
Wufoo - Build & host forms - Design
Wuraweb - Find local prices & credentials - Ecommerce
Wwwhatsnew - 2.0 blog - About
Wyacracker - Build your own widgets - Software

XXX
Xanco~ - Mobile phlog & vlog - Publish
Xanga - Blog rings - Community
Xboxkicks - Digg Xbox news - Dig
Xcavator - Search & sort images - Search
Xcellery - Online spreadsheet - Office
Xdrive - Store & share your data - Store
Xfruits* - Mix, make & share feeds - RSS
Xilinus - Social bookmarking - Bookmark
Xin - Online OS for Ajax serverapps - OS
Xing** - Community for entrepreneurs & professionals - Community
Xmailharddrive - Store data thru Gmail - Store
Xmetal - XML authoring suite with 6 applications - Software
Xmlhttprequest - Track Web 2.0 news - News
X-moment*~ - Publish an event at a location - Geo
Xtube - Upload & share your porn - Porn
Xuqa - Publish yourself & connect to anyone - Community

YYY
Yackpack - Group voicemail - Communicate
Yadis - Foundation for URL-based identity management - Identity
Yahooanswers - Share Q&A - Knowledge
Yahoodevelopernetwork - Javascript developer center - Software
Yahoomaps* - Global & local maps & search mash-ups - Geo
Yahoomyweb2 - Social bookmarking - Bookmark
Yahootagsoup - News tag cloud; news mash-up - News
Yahoovideo - Submit & share videos - Video
Yakalike - Chat while you surf websites - Communicate
Yardbarker - Digg sports news - Dig
Yashi - Upload & share video(Merged with Bolt) - Video
Yawords - Buy a search term, eternally - Marketing
Yay2dot0logoparody - Traditional brands in 2.0 design style - Fun
Yazai - Sell your content - Multimedia
Yellowbook - Yellow pages aggregator - Search
Yellowikis - Social business directory - Marketing
Yelloyello~ - Review & rate companies in directory guide (mash-up) - Rate
Yelp - Find, review & discuss local restaurants etc - Ecommerce
Yesnomayb - Find, get introduced to & date with people with same tastes - Date
Yfly - Meet celebrities, share content - Community
Yigg - Digg, too (DE) - News
Yiibu - Remix, adapt, expand, share & sell content - Multimedia
Yodlee - Bank, pay, manage your wealth & risk - Finance
Yodpod - Feed reader - RSS
Yokel - Find best prices for products near you - Ecommerce
Yoono - Search, exchange & share information - Search
Yoople - Search & collaborate on improving search results - Search
Yoosi - Create your personal start page - Portal
Yorz - Join group, upload resume - Employment
Yotophoto - Publish & sell photos - Images
Youaretheguest - Invite yourself to a talkradio podcast show - Audio
Youhavebo - Anti-social software - Fun
Youmail - Record unique voice mail recordings for anyone that calls you - Communicate
Youmeus - Relationship advice community - Date
Youos - OS in your browser; standard apps + develop yourself - OS
Youpickthenews - Digg news - Dig
Youporn - Upload (not really…) & share lousy porn videos - Porn
Yourdraft~ - Create & share drafts - Office
Yourep - Store, organize & share your photos - Images
Yourgmap - Map & publish your places - Geo
Yourminis - Goowy without the news -> personalized services portal - Portal
Yournextdrink - Publish, vote for & share drink recipes - Community
Yourspins - Remix, publish & share tracks legally - Audio
Yousendit - Email large files - Communicate
Youshouldmeet - Refer your friends to friends - Office
Youtorials - Collaborate on tutorials - Knowledge
Youtube* - Upload & share video - Video
Yub - Meet, hang & get discounts in shopping mall - Ecommerce
Yubnub* - Search & share search commands - Search
Yugma - Free web conferencing - Communicate
Yuku - Share your profiles
Yutter - RSS feed2email subscription - RSS
Ywoosh~ - Find or sell houses - Ecommerce

ZZZ
Zaadz~ - Network of inspired people - Community
Zackbookmaps - Locate & lend books (map mash-up) - Economy
Zamily - Connect & share with your family - Community
Zamzar* - Convert your files online - Software
Zapr - Upload & share your files - Multimedia
Zaptxt - RSS to email, sms, messenger - RSS
Zapzap - Digg podcasts - Dig
Zattoo - TV over IP (CH only) - Video
Zazzle - Design, sell & buy custom goods - Ecommerce
Zcubes - Os in your browser - OS
Zebo - List & share what you own & what you want - Ecommerce
Zecco~ - Trade stocks for free - Finance
Zeedex - Search with suggestions - Search
Zeedive - Dutch auction - Ecommerce
Zeemaps - Create & share maps of/with friends & family - Geo
Zemble - Communicate, collaborate & connect thru group text - Communicate
Zenfolio - Host photo gallaries - Images
Zestr - Catalog all your media online - List
Zexsports - Networking for extreme sports lovers - Community
Ziblit - Recommend businesses to other consumers - List
Ziddio - Upload, rate & share videos - Video
Ziggs - Index of professionals - Community
Zigtag - Search, save & share results - Search
Ziki - People matching thru tagged interests - Community
Zillow - Get your home valuated (map mash-up) - Ecommerce
Zilzle - Profile yourself & your friends - Identity
Zimbio - User generated network of public portals - Portal
Zimbra - Work & communicate together - Organize
Zingku - Text2website content sharing - Community
Zipcar - Share your car - Economy
Zipingo - Find local business based on community input - Ecommerce
Zippyvideos - Upload & share video - Video
Zirrus - Ajaxified, tagged to do tool - Office
Ziwiki - Create & share your wiki - Publish
Zixxo - Create & distribute online coupons - Ecommerce
Zlango - Icon language for sms - Communicate
Zlio - Social commerce - Ecommerce
Zogix - Innovators' community - Knowledge
Zohochallenge - Collective polling - Survey
Zohochat - Create your own chat room - Communicate
Zohocreator - Create & share applications - Software
Zohocrm - Web-based crm - CRM
Zohoplanner - Create & share memos & notes online - Office
Zohopolls - Create, share & vote - Survey
Zohoshow - Create, edit & publish presentations online - Office
Zohovirtualoffice - Online office suite - Office
Zohowriter - Online word processor - Office
Zoints - Publish & share your content, and meet - Community
Zonetag - Get tag suggestions for your photos - Images
Zoodango - Have a coffee with other professionals - Community
Zookoda - Promote your blog with email marketing - Marketing
Zoom~ - Upload & share photos - Images
Zoomblast - Upload, rate & share videos - Video
Zoomclouds - Make & publish tag clouds - Tag
Zoomf - Search with map mash-up - Search
Zoominfo* - Search persons; create your own page - Community
Zoomshare - Free website community - Store
Zoomtags - Tag cloud based affiliate network - Marketing
Zooof* - Discover, maintain & extend your family ties - Community
Zooomr~ - Find photos & make friends in many languages - Community
Zoozio - Personal homepage - Portal
Zopa - P2P banking services - Economy
Zopto - Add your stuff to & share places - Community
Zorpia - Upload & share photos - Images
Zoto - Upload, phlog & share - Images
Zshare - Host & share your media - Multimedia
Zuggest - Search Amazon as you type - Search
Zunafish - Buy & sell old media items - Ecommerce
Zurpy - Save & organize bookmarks - Bookmark
Zuzu~ - Keep track of your friends' birthdays etc. - Office
Zvents - Organize & manage events - Office
Zweitgeist - Meet & communicate with people on websites - Communicate
Zyb - Store, manage & share your cell's data - Store
Zypsy - Post & get matches for classified ads thru cell & email - Marketing

Update 070127.

Update 070128 - The following websites were or appeared to be dead or defunct today, so I deleted them from the list above:

Talkdiggeralpha* - Semantic tools to find, follow & join web conversations - Community
Ticklr - Store, share & tag legal bookmarks - Bookmark
Venturfundr - Online self-serve Venture firm - Finance
Vpodtv - Create & share your (mobile) tv channel - Video
Webcollaborator - Collaborate online - Organize
Weblogwire - Connect bloggers to PR world - News
Wideword - Create & share documents online - Office
Xista - Get more info searching - Search
Xposted - Buy & sell your content - Multimedia
Yummy - Store, share & tag pdf files - Bookmark
Yurnet - Übersearch - Search
Zero-zero - Meta mash-up for soccer news - News
Zingee - Store & share files (now www.zapr.net) - Store