Q - S; Update

QQQ
Qelly - Meta search engine - Search
Qipit - Capture it, submit it, get back a pdf & share it - Office
Qlock - Time mash-up - Organize
Qloud - Social music search & buy service - Ecommerce
Qnalive - Microsoft's Q&A - Knowledge
Qoogle - Video search - Search
Qoolsqool - Digg school knowledge - Dig
Qoop - Publish & sell photos & photo products - Ecommerce
Qoosa - Social bookmarking - Bookmark
Qooxdoo - Javascript GUI toolkit - Software
Q-phrase - Search solutions (clients) - Search
Qtsaver - Micro content search; Google & Yahoo mash-ups - Search
Qtsearch - Search for content in Yahoo & Google - Search
Quadriot - Digg strange news - Dig
Qube - Search engine aggregator (client) - Search
Qucikbrowse - Combine your favorite pages in 1 email - Portal
Quece - Conversational search - Search
Queeky* - Make drawings online & share them - Images
Queoo - RSS to email, messenger - RSS
Questionform - Create, publish & analyse surveys - Survey
Questionize - Q&A - Knowledge
Questionville - Q&A - Knowledge
Questsin - Collaborate on dictionary - Publish
Quickbase - Project management solution - Organize
Quickcamp - Organize your projects - Organize
Quickmail - Email2RSS - Communicate
Quickmuse - Battle of the poets - Vocubalary
Quicktoons - Create & share comics - Publish
Quicktopic - Group message board - Communicate
Quimble - Create, vote for & search polls - Survey
Quintura - Search engine with visualized context terms (client) - Search
Quizilla - Create & share content - Multimedia
Qumana - Edit your blog - Publish
Qunu - Get or offer help - Economy
Quomon - Q&A for IT issues - Knowledge
Qvey - Create & pay or participate & get paid for surveys - Survey
Qwer - List & share your things to do - List
Qwerky - Search strange site names - Search
Qwika - Search wikis - Search
Qype - Find & recommend best spots in town - Collaborate

RRR
Rabble - Create it & share it mobile - Community
Radar - Upload & share photos & videos - Multimedia
Radeo - Compile & share playlists - Audio
Radioblogclub - List & save your favorite tracks - Audio
Radiohandi - Group chat - Communicate
Radiotaleripple - Analyse your podcast's stats - Software
Radiotime - Personalize radio - Audio
Radiusim - Location enhanced messenger service - Communicate
Radrails - Develop Ruby on Rails apps - Software
Railsbase - Application hosring (Ruby-based) - Store
Raisingthem - Publish & share parenting tips - Community
Rallypoint - Share knowledge - Knowledge
Rapidfeeds - Publish feeds without tech know-how - RSS
Rapidobject** - Create, print, sell & buy 3D objects - Personal manufacturing
Rapleaf* - Manage your reputation & rate your friends - Identity
Rasasa~ - RSS-based news alert service - News
Rasterbator - Creates rasterized images - Design
Rateitall - Rate & share opinions on everything - Survey
Rateordate* - Crowd match, singles event maps, online dating - Date
Rawsugar - Social bookmarking directory & revenue sharing - Economy
Razz - Record & load up audio to your blog - Audio
Rbloc - Sell, buy & meet auction market place - Marketing
RDFcalendar - Meta calendar - Office
Reader2 - List, review & discuss books - List
Readio - Blog2podcast - Audio
Readitswapit - Swap books - Economy
Readspeaker - Text2speech app (Spanish) - Communicate
Readwriteweb - Reviews Web 2.0 things - About
Realtimematrix - Solution to personalize your content for any device - Software
Reblogger* - Collect, filter, sort, index & publish feeds - RSS
Rebtel* - Call international at local rates - using your cell phone - Communicate
Recipething - Organize & share your recipes - List
Recommendit - Social bookmarking - Bookmark
Recruiterredbook - Find the right recruiter - Employment
Redbet - Betting exchange - Gamble
Reddit - Digg news - Dig
Redditnsfw - Bookmark, rank & share porn links - Porn
Redfin - Find housing (map mash-up) - Geo
Redlettr - Tag & comment the bible - Collaborate
Redlightcenter - 3D adult community - Community
Redrockbay - Customize your news - News
Redswoosh - Upload & share video, audio & other big files - Multimedia
Redtoucan - Share photos & review products - Ecommerce
Reevoo - Review & buy electronics - Ecommerce
Referralmonitor - Manage word-of-mouth marketing - Marketing
Refilter - Filter your feeds - RSS
Regger - Datamine your blog - Dbase
Rel8r - Tag, read, search blogs - Collaborate
Relate-a-zon - Pathfinder game (mash-up with Amazon) - Game
Relatime - Present & share ideas about time - Office
Relenta - CRM tool set - CRM
Releton - Google + Yahoo + maps & routes - Search
Relevantview - Captures behavior & opinions - Survey
Relishio - Digg news - Dig
Reminderfeed - Send reminders to your feed reader - Office
Remix - Remix & share videos - Video
Remotecontrolmail* - Go thru your snail mail digitally before you receive it - VAS
Renkoo - Arrange when & where to meet your friends - Community
Rentmeavacation - Share your vacation homes - Ecommerce
Rentxista - Rent a page - Marketing
Reply - Get info on value of homes & cars in USA - Search
Reputata - Manage your reputation (stealth) - Identity
Reputationdefender - Have all negative things about yourself destroyed online - Identity
Reputator~ - Manage your reputation online - Employment
Resellular - Get out of your cell contract, or take over a contract - Economy
Resizr - Resize images online - Images
Resultr - Meta search with agents - Search
Retrevo - Meta product search - Search
Retrievr* - Search images by sketching - Search
Reviewme - Pay or get paid to review web sites - Publish
Revision3 - TV network for the web - Video
Revver - Upload, share or sell your videos - Ecommerce
Rhapsody - Listen to free music, share playlists - Audio
Riffs - Recommend, chat & share - Knowledge
Rightcart - Sell your own or 3d parties' stuff on your site - Ecommerce
Ripple - Be your own banker - Finance
Riya* - Face recognition based photo search - Search
Rminder - Text2phone reminder service - Office
Rmxdirect - Auction your ad inventory - Marketing
Robinfood - Subscribe to gameshow, donate; if you win spend 1 million on good causes - Game
Rocketboom - View & contribute to daily vlog - Video
Rockyou - Publish & share photos - Images
Rojo - Discover, organize, read & share content - News
Rollyo* - Create search agents - Search
Root* - Trading platform for realtime consumer data - Marketing
Rootly - Refine your news search - Search
Rootvaults* - Store, manage & share knowledge online - Knowledge
Roughunderbelly - Score points on completion of your tasks - Organize
Roundcube - Webmail - Communicate
Roundedcornr - Generate & share code for rounded corners - Fun
Routecraft~ - Route planner; add your text to locations & share it; also for mobile - Geo
Roxio - Try out free media apps - Software
Roxomatic - Social bookmarking review - About
RR-JJ - Publish & share quotes - Office
Rrove* - Save & share places - Collaborate
RSS2PDF - Convert feeds to PDF - RSS
RSSbandit - Feed reader - RSS
RSSbus - Connect & share your data thru feeds - RSS
RSScalendar - Manage & share your calendar - Office
RSSfwd - RSS to email - RSS
RSShut - Read & search feeds - RSS
RSSmad - Feed reader & archive - RSS
RSSmicro - Feed search - Search
RSSor - Collect, read & share feeds - RSS
RSSreader - Feed reader - RSS
RSSweather - Weather feeds - News
Rubyonrails* - Web development framework - Software
Runfatboy - Manage your diet & fitness - VAS

SSS
Sabifoo - Read & publish news through messenger - News
Sabrosus - Store & share bookmarks - Bookmark
Safariu - Create, publish & share science materials - Publish
Safemail* - Create an uncrawlable image of your email address - Software
Saki - Mobile community - Community
Salaryscout - Share salary info & discover your true value - Employment
Salesgenius - Track your prospect's behavior online - Marketing
Sameplace - Chat while you surf - Communicate
Sametalk - Chat with other site visitors - Communicate
Sampa - Build a website - Software
Sanebull - Customizable start page for stock information - Finance
Saulweiner - Meta Web 2.0 list - About
Savedsearchpro - Find Ebay deals easier - Ecommerce
Savemyass - Send your wife flowers frequently - Ecommerce
Savemyporn - Adult search - Porn
Savetoby - Donate or else… - Economy
Sawlogs - Publish & share your dreams - Publish
Sayoutloud - Post questions & issues, get answers or reactions - Knowledge
Say-so - Share problems & get advise - Collaborate
Sayswap - Game trading community - Community
Scatterchat - Secure IM for activists & dissidents - Communicate
Schoolbank~ - Profile yourself & find back class mates - Community
Schooltool - School calendar & info system - Software
Schoopy - Classroom organizer & site hosting - Software
Schtuff - Wiki service - Publish
Scooch - Create & share slide shows - Images
Scooop - Digg news (scoops) - Dig
Scoopgo~ - Create & maintain news search agents - Search
Scoopity - Digg gossip - Dig
Scooplive - Sell your scoops live - News
Scoopt - Upload & sell news photos - Images
Scrapblog - Scrap, blog & share - Software
Scratchlist - Social bookmarking, partly automated - Bookmark
Scratchnscribble - Mail real handwritten postcards - Communicate
Scribefire (formerly: Performancing) - Blog metrics - Stats
Scriptaculous - Javascript libraries 2.0 style - Software
Scriptmimic - Find or publish & share scripts - Software
Scroogle - Google without ads & other evil - Search
Scrybe - Share calendar, lists etc - Office
Scuttle - Social bookmarking - Bookmark
Searchfox - Social bookmarking - Bookmark
Searchinsidethemusic - Search music by content and context (stealth) - Audio
Searchles - Submit, tag & share sites - Bookmark
Searchmapr - Cluster your search results in treemap - Search
Searchmash - Ajaxified search playground for Google - Search
Secondlifeboutique - Buy real things with virtuaa money - Economy
Seconds11 - Promote (11 seconds) of your podcasts - Audio
Secondsite - Web-based invoicing - Finance
Seedwiki - Create wikis & blogs - Publish
Seekum - User ranked search results - Search
Selectminds - Facebook & collaboration tools for staff and alumni - Collaborate
Selectrecruiters - Find the right recruiter - Employment
Selfcast - Upload, watch & share vids - Video
Sellaband~ - Promote your music & find 5000 fans - Economy
Selsius - Real estate community - Community
Semantical - Sementic search engine software - Search
Semanticthoughts - Get all 2.0 lists in OPML - About
Semapedia** - Add wikipedia tags to real world things - Tag
Sendspace - Email large files - Communicate
Serversidewiki - Mini-wiki - Publish
Sevenload*** - Upload & share photos & videos - Multimedia
Sexbyrss - Personalized porn thru rss - Porn
Sexycanvas~ - View & purchase erotic art (Browse through tastefully decorated rooms or upload an image of your own room to experience the works in various settings). - Ecommerce
Sf0 - Collaborative production game & community - Game
Sfzero - Build your character by completing group tasks - Game
Shadows - Social bookmarking - Bookmark
Shakkus - Bookmark, rank & share entertainment news - News
Shamblesweb2 - Categorized 2.0 list - About
Sharecare~ - Organize yourselves in groups to share care - Community
Sharepointkicks - Digg Sharepoint news - Dig
Shareyourlook - Community for fashion addicts - Community
Shareyouropml - Share outlines, feed & taxonomy - Knowledge
Sharingpoint - Publish, link to & share health information - Publish
Sharkle - Watch, vote for & share videos - Video
Sharpcast - Synchronize all photos online & mobile - Images
Shazam - Have music recognized thru your cell - Audio
Shelfari - Show, review, share your books - Community
Shinyletter - Mail2snailmail - Communicate
Shooshare - Upload & share your porn - Porn
Shooter7 - Send photos, videos, music (app) - Multimedia
Shoposphere* - Create & share pick lists - Ecommerce
Shopwiki - Search 120,000 stores - Search
Shorttext - Create & share URL's to text notes - Office
Shoutcentral - Publish yourself & chat while you surf - Community
Shoutfit - Share trends & friends - Community
Shoutwire - Digg news - Dig
Showbloggers - Digg tv shows - Dig
Shozu - Upload & share photos, videos & text on your mobile - Multimedia
Shutterbook - Store & share photos - Images
Shutterfly - Store, share & print photos - Images
Shutterseek - Digg photography news - Dig
Shuzak - Community for geeks (with Digg-like features) - Community
Sidejobtrack - Job tracker - Employment
Sidekiq* - Hyper meta search - Search
Sideklick - Get contextually relevant video suggestions added to your IM - Communicate
Sideload - Share free music files - Audio
Sidenotes - Make & share notes on web pages - Office
Sidewalk - Create Ajax forms - Software
Sightspeed - Voice & video over IP - Communicate
Simile - Interoperates metadata in unlike environments - Bookmark
Simile - Semantic interoperability of metadata and information tools - Software
Similicious - Search for similar websites - Search
Simplelog - Blog application - Software
Simpleseating - Seating tool - Software
Simpleticket - Helpdesk solution - CRM
Simplifid - Zap from identity to identity online - Identity
Simplybill - Invoice management - Finance
Simplygoogle - Everything Google on 1 page - Search
Simplyhired - Local job search - Employment
Simpy - Social bookmarking, tagging & search - Bookmark
Singlesearch - Two way matchmaking - Date
Singlestatus - Myspace alert mash-up on member status - Community
Singshot - Record & share your own songs - Audio
Sitebar - Social bookmarking - Bookmark
Siteblimp - Promote your online identity thru search - Identity
Siteflavoredgoogle* - Tailor adwords to your site - Ecommerce
Sitejot - Social bookmarking - Bookmark
Sitekreator* - Build, publish & host websites - Software
Sitemeter - Web stats - Stats
Sitepal* - Design speaking animated avatars - Communicate
Siteshuffle - Make a slideshow from your favourite websites - Portal
Sitetagger - Social bookmarking - Bookmark
Sitevista - Test your website - Software
Sizeasy - Compare sizes of online goods with everyday items - Ecommerce
Skeletonz - CMS solution - Publish
Sketchup - Create & view things in 3D - Design
Skibonk - Ski resorts (map mash-up) - Geo
Skillmeter - Identify, measure & retain talents thru assessments - Employment
Skillsfeed - Share knowledge - Knowledge
Skillswap - Swap your web design skills - Community
Skimcss - Digg CSS - Dig
Skinnyr - Track your weight - VAS
Skobee - Arrange meetings & events online - Office
Skoeps~ - Citizen journalism based news - News
Skombo - Sell & buy rare music - Ecommerce
Skrbl - Publish & share notes - Office
Skuer - CSS search engine - Search
Sky-click - VoIP call center solution - CRM
Skyhook - Wi-fi positioning - Software
Skylook - Record & store all Skype communications - Communicate
Skype - Call, conference, messenger, file sharing - Communicate
Slashdigg - Slashdot + Digg mash-up - News
Slawesome - Add voice to your email - Communicate
Slide* - Create photo loops & share them on your website - Images
Slidestory - Publish stories with photo slideshows - Images
Slimtimer - Organize your projects - Organize
Slingmedia - Watch tv over ip wherever you are - Video
Slister - Bookmark & list products - Ecommerce
Slurlmaker* - Bookmark sites in Second Life - Bookmark
Slut-o-meter - Calculate your popularity - Identity
Smarkets - Stock markets for products - Economy
Smarking - Social bookmarking - Bookmark
Smartimagine - Store & manage your image & media files - Store
Smartpox - Sema-encode & share URLs, phone numbers & email addresses - Identity
Smashmyviper - Buy pixels to destroy car - Economy
Smblive - Share all business applications - Software
Smikioo - Catch yourself smiling & get comments - Community
Smilebox - Pimp up your photo presentation - Images
Smllr - Tag your Flickr photos with smells - Fun
SMP - Search & save porn - Porn
Smugmug - Store & share photos - Images
Smutvibes - Hook up with hot friends, meet new people (adult stuff) - Community
Snacksby - Tell what you have in your pantry and get a recipe - VAS
Snag - Find friends & get other features from all your networks - Identity
Snaket - Clustered search - Search
Snap - Ajax search, shows found pages - Search
Snapbits - Store, sort & retrieve bits of information - Office
Snapfish - Upload & share photos - Images
Snapjot - Organize & share photos, videos, text & communications - Multimedia
Snapmania - Upload, edit, organize & share photos - Images
Snappages - Publish & share your life with this toolset - Community
Snappreview*** - Offer your site's visitors a preview of any page you link to - Publish
Snapshirts - Get your T-shirt with a tag cloud - Tag
Snaptune - Record music from radio to hard disk - Audio
Snapvine - Send audio files to & communicate with your friends, on your cell - Audio
Snipit - Clip parts of web pages - Bookmark
Snipperoo - Add, remove & manage widgets - Software
Snipplr - Delicious for programmers - Bookmark
Snipshot - Edit pics online (a.k.a. Pixoh) - Design
Snubster - Get rid of your friends - Community
Snunk - Search & vote - Search
Soapboxit - Share reviews on everything & everybody - Community
Soapbx - Present online - Office
Social21 - Be matched & date - Date
Socialbookmarking - Social bookmarking - Bookmark
Socialcircles* - Visualizes relations in an email database - Dbase
Socialcookbook - Post, rate & review recipes - Publish
Socialexplorer - Find out about your neighbours - Community
Socialight - Share pictures & notes with your cell phone - Collaborate
Socializer - Submit social bookmarks at many websites - Bookmark
Social-mail - Email2RSS - Communicate
Socialmarks - Social bookmarking - Bookmark
Socialmeter - Check your 2.0 site's popularity in 2.0-sphere - Survey
Socialpicks - Analyse & recommend stocks with your peers - Finance
Socialporn - Digg links to porn - Porn
Socialtext - Enterprise wiki solutions - Publish
Solomodels - Upload, commicate with, vote for, hire or buy from photographers & models - Ecommerce
Solutionwatch - Reviews & lists of school & study tools - About
Solutionwatch* - Reviews of 2.0 websites - About
Solve360 - Groupware CRM - CRM
Songbird - Media player & web browser - Multimedia
Songbird* - Browse, download, manage & share all media - Browse
Songrio - Digg music tracks - Dig
Sonific - Claim a song & publish it on your site - Audio
Sonr - Track media & media users - Multimedia
Soonr - Mobile2web & v.v. - Communicate
Sorrygottago - Anti-communication software - Fun
Souki~ - Local shop search - Ecommerce
Soulcast - Blog solution - Publish
Soundbite - Submit & share sound bites - Audio
Soundblog - Reviews & lists of sound apps (& other cool stuff) - About
Soundtransit~ - Add your sounds to locations & share them - Audio
Spambob - Disposable email addresses - Communicate
Spankwire - Digg porn - Dig
Sparkhive - Store & share thoughts, research, bookmarks - Knowledge
Speedtest* - Check your ISP's speed - Software
Spellwithflickr - Spell names with photos; Flickr mash-up - Images
Sperocite - Spiritual Digg - Dig
Sphere - Search the blogosphere - Search
Spherexplorer - 3D web browser - Browse
Spicydigits - Manage shared expenses - Finance
Spillr - Q&A - Knowledge
Spinspy - Digg links - Dig
Spinvox - From voice to text to mobile or email - Communicate
Splashblog - Publish & share mobile photos - Images
Splashdata - Mobile tools for media, payments, shopping… - Software
Splice* - Mix, mash-up & share your music - Audio
Splitgames - Trade games (French) - Economy
Spokeo - Aggregate & share your social network profiles & content here - Community
Spongecell - Arrange meetings & events online; with AI - Office
Sponit - Publish & share funny news - News
Spore*** - User generated gameplay & characters - Game
Sportiki - Wiki on sports - Publish
Sportingo - Publish & share sports content - Publish
Sportsblink - Digg sports news - Dig
Sportsmates - Sports bloggers community - Community
Spotback - Customize your news through your clicking behaviour - News
Spotrunner - Recycle, recreate & air tv ads - Marketing
Spotscout - Find or sell parking space - Ecommerce
Spout - Publish & share reviews, buy films - Video
Sprajax - Security for Ajax - Software
Spreadfair - Spread betting exchange - Gamble
Spreadshirt* - Design, buy or sell your T's - Ecommerce
Spresent - Create, edit & share flash presentations - Office
Springdoo - Add your voice to your email - Communicate
Sprinko* - Do & share everything here - Community
Sproose - Personalize search results & share them - Search
Sproutit - Mailroom: process email together - Communicate
Sproutliner - Manage your tasks - Office
Spurl - Bookmarking & search - Bookmark
Spymedia - Publish & sell news photos - Ecommerce
Squadrapiloti - Tell about your car, get matched with other cars - Economy
Squawklive* - Mashes up stock data & news, sends alerts - Finance
Squeet - Get news, blogs, RSS or feeds in your email - News
Squidoo - Share knowledge - Knowledge
Squirl - Organize & share your media collections - List
Squurl - Rapid domain search - Search
SRC - Clustered search - Search
Stabilo-boss - Web 2.0 annotated logo cloud - About
Stalkerati - meta search for people - Search
Standpedia - Publish & share your opinions - Publish
Standpoint - Share & evangelize convictions - Collaborate
Staralicious - Digg (news about) celebrities - Bookmark
Stardoll - Dress up & share your favorite celebrities - Community
Stargazer - Free web-based tools for families & charities - Software
Stars-of-the-Web - Create & publish vids for vlogs - Video
Start - Personal portal - Portal
Start12*~ - Find, compare & review online service providers - Ecommerce
Startaid - Manage & share your (thumb) bookmarks - Bookmark
Starterbase - Create, organize & share data on the web - Office
Startforce - Start page with OS features - OS
Statcounter - Web stats - Stats
Stellent - Enterprise blogging & wiki - Software
Stickam* - Multimedia communication tool - Communicate
Stickis - Publish & share notes on websites - Office
Stikipad - Wiki solution - Publish
Stikkit - Make notes & get alerts - Office
Stockarena - Post on stocks, get graded & make money with it - Community
Stockdigg - Read, submit & rank financial news - News
Stocktickr - Create & share stock watchlists - Finance
Storycode - Read, code, find & share books - Economy
Strategicboard - Share tech news - News
Streamdrive - Upload & share multimedia - Multimedia
Streamick - Co-decide on video streams published - Video
Streamload* - Store & share your media - Multimedia
Streampad - List, listen & share your music (= several mash-ups) - Audio
Streeteasy - Share shopping info - Ecommerce
Stridr - Upload & share or sell music - Audio
Stripgenerator - Create & share comics - Publish
Strmz - Clip & share tv & video - Multimedia
Strongspace - Upload, store, back-up & share your files - Store
Structuredblogging - Create, edit & maintain all posts - Publish
Studicious - Online note taking & sharing - Collaborate
Studybuddy - Share notecards - Office
Stufflinker - Mobile and web bookmarking - Bookmark
Stuffopolis - Keep track of things you lend or borrow - Economy
Stuffspace - List & share what you own & what you want - Ecommerce
Stumbleupon - Social bookmarking (random sharing) - Bookmark
Stylefeeder - Find, share & keep track of cool products - Ecommerce
Stylehive - Get recommendations fitting your product interests - Ecommerce
Subethaedit - Edit & share texts together - Office
Subscribecast - Sell content thru RSS-based subscription format - Ecommerce
Subwaycrush - Dating(?) - Date
Suckingfish - Save, collaborate on & publish search results - Search
Sugar - Ecosystem of Women's communities - Community
Sugarcrm - Open source CRM - CRM
Sugarstats - Manage, monitor & share your blood sugar level - VAS
Suggestica - Get media suggestions from experts - Multimedia
Suitetwo - 2.0 toolset for enterprises - Software
Sundaydash - Find housing (map mash-up) - Geo
Sundera - Collaborate online on spreadsheets - Office
Supcast - Publish your media online thru your cell - Publish
Superoyster - Sell oe buy your place at a waiting list - Economy
Superstart - Personalized shopping portal (Swedish) - Ecommerce
Superviva - Share & get ideas for a better life - Community
Suprcilious - Tag all other tag sites - Tag
Suprglu - Delicious/Flickr/Blogger/etc. mash-up - Portal
Surfninja - Ajax start page - Portal
Surftail - Share your click paths - Bookmark
Surfulater - Collect, save & manage all your info - OS
Surfwax - Multisource search - Search
Sutori - Publish & vote on stories - Publish
Swabba - Online garage sale (German) - Economy
Swagroll - List & share all your media - Multimedia
Swamii - Create cross media search agents - Search
Swapcore - Watch, read & swap it - Multimedia
Swapsimple - Trade your media - Ecommerce
Swaptree - Swap your media - Economy
Swapzies - Store & share or sell multimedia - Multimedia
Swarmofangels - Participate in new cinema - Finance
Swarmsketch - Collective sketching - Images
Swarmteams* - Solutions to set up & manage mobile One2- or Many2Many community communications - Software
Swarmthedotcom* - See how other people browse & chat (Firefox) - Communicate
Swicki - Search with user input - Search
Swift - Safari-like browser for Windows (very alpha) - Browse
Swik - Search for open source software - Software
Switchdiscs - Trade media online - Ecommerce
Swivel - Publish & share data - Data
Swoogle - Semantic web search engine - Search
Swoot**~ - Build your own browser - Browse
Sxc - Upload & share or browse stock photos - Images
Sxip - Control personal digital identity - Identity
Sxipper* - Wand service (with OpenID; Firefox only) - Identity
Sxore - Manage your online reputation - Identity
Synapselife - Customizable 2.0 services portal - Portal
Sync~ - Customize your info on special interests - News
Sync2it - Social bookmarking - Bookmark
Synchroedit - Group editor - Publish
Syncnotes - Create & share notes - Office
Syncone - Social bookmarking - Bookmark
Synthasite - Collaborate on site development - Software
Sys-con - Multimedia magazine - About
Systemone - Enterprise knowledge sharing & management - Knowledge

Update 070127.