Mister-wong

Social bookmarking

Newzbubble

Read your news from bubbles

Nestoria

Property search (UK)

Bluechipexpert

Profile yourself, invite friends & recruit other professionals, and get paid

Xtube

Upload & share your porn

Bookrevyoo

Social book review community

Synthasite

Collaborate on site development

Mybigfishgames

Review & share casual games & get rewarded

Dovetail

High quality video sharing for pros

Saki

Mobile community

Faceparty

Clubber community (UK)

Swarmsketch

Collective sketching

Traineo

Share your weight loss with your motivators

Ilovefreewifi

Contribute to dbase of free wi-fi hotspots in USA

Ohloh

Search indexed open source projects

Slimtimer

Organize your projects

Recipething

Organize & share your recipes

Web20palette

Color palette for Web 2.0 design

Skimcss

Digg CSS

Bookmooch

Exchange old books

Bouldr

Share climbing (map mash-up)

Xing sneak preview

Soapboxit

Share reviews on everything & everybody

Hoverspot*

Publish & share your profile

Diggswarm & Diggstack

See diggers swarm around active stories;
At Diggstack you can see diggers fall on active stories

Blotter

Graph your blog's popularity

Cleversafe

Software for dispersed data storage

Faketown

Create, buy, sell, trade & share virtual assets

Chickadvisor*

Get & share advise on what chicks should do & buy

Hotspots

Network for urban professionals

Islandoo

Temporary (?) community for tv show's casting

Treemo

Post, manage & share media online & mobile

Weatherbug

Share video weather casts

Googdesk

Meta search

Teamspinner

Organize & manage your projects

Calcr

Online calculator

Anobii

Publish, share & discover booklists

7tipson - Browse & share tips

Voices

Market place for voice overs

Dsimobile

Start an mvno network

Protolize

Digg web tools

Yfly

Meet celebrities, share content

Hotspottin

Share your favorite hotspots

Lingr

Chat community