| Bookmarking | Del.icio.us | StumbleUpon | Furl | Mister Wong, Ma.gnolia |
| Books | Lulu | Biblio | VuFind | WorldCat, LibraryThing |
| Classifieds and Directories | Craigslist | Oodle | Parking Search | Go2Web2.0 |
| Collaborative Writing and Word Processing | Google Docs | Writeboard | Thinkfree | Celtx |
| Content Aggregation and Management | Wufoo | Dabble DB | EditGrid | Instant Bull |
| Digital Storage and Remote Access | Onmidrive | Fluxiom | esnips | Totoexpress |
| Education | .Docstoc | Mango Languages | SpanishPod | Livemocha |
| Employment and Jobs | Standout Jobs | CareerBuilder | Monster | Mployd |
| Events | Upcoming | Going | Confabb | Eventful |
| Food | Im Cooked | Urbanspoon | iFoods | Recipe Key, Crazymenu |
| Fun Stuff | Cocktail Builder | HairMixer | Comiqs | One Sentence |
| Games and Entertainment | Zango | Galaxiki | Doof | Guess The Google, Arcaplay |
| Genealogy | MyHeritage | Geni | Amiglia | GeneTree, AncestryPress |
| Guides and Reviews | Yelp | Google Local | Citysearch | Yahoo! Local, Menuism |
| Health | Revolution Health | PEERtrainer | iMedix | Icyou, Health Ranker, Medstory |
| Hosted Wikis | PBwiki | Wetpaint | Wikispaces | Wikidot |
| Mapping Applications | Frappr | Wayfaring | CommunityWalk | Rrove, InteractiveMaps |
| Maps | Google Maps | Live Maps | Google Earth | Yahoo! Maps |
| Mobile Technology | Twitter | Myxer | Juicecaster | Plusmo |
| Music | Last | Pandora | Mog | Amie Street, LyricsMode |
| News and Blog Guides | Google Blog Search | Bloglines | Technorati | Icerocket |
| Niche Social Networking | MothersClick | Tu Diabetes | Imbee | Motortopia |
| Online Desktop / OS | Zimdesk | G.ho.st | Goowy | Glide Digital |
| Organization | Backpack | Zoho | Wufoo | |
| Philanthropy | Care2 | Giveness | DonorChoose | BeGreenNow |
| Photos and Digital Images | Flickr | Picnik | Picasa | Splashup |
| Professional Networking | LinkedIn | Biznik | Professional On The Web | Xing |
| Questions and Advice | Yahoo! Answers | Minti | Fixya | BuzzDash |
| Real Estate | Zillow | Rentomatic | HotPads | |
| Retail | Threadless | Etsy | Stylehive | StylePath, Shopify |
| Search | Tweetscan | Rollyo | 50 Matches | Alpha Search |
| Social Networking Mainstays | Twitter | Facebook | Bebo | MySpace, Friendster |
| Social News Smaller and Niche Sites | Sphinn | NowPublic | PlugIM | Campus Reader, Design Float |
| Social News The Big Guys | Del.icio.us | Digg | Reddit | Mixx |
| Sport | iStats | TeamSnap | Oobgolf | Gympost |
| Start Pages | Netvibes | Pageflakes | iGoogle | My Yahoo, Groovle |
| Travel | Farecast | Kayak | Boo | Gusto |
| Video | YouTube | BBC Player | Metacafe | Dailymotion |
| Visual Arts | ColorBlender | Swivel | VisualComplexity | The One Million Masterpiece, The Broth |
| Web Dev | Yahoo! Pipes | Yahoo! User Interface Library | jQuery | Collabtrak |
| Widgets | Yourminis | Flock | Clearspring | SpringWidgets, Conduit
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