Check Username Availability at Multiple Social Networking Sites
Plancast - Find Things to Do & Upcoming Local Events | Event Planning & Promotions | Plancast
Listgeeks
Voote.com - Online Polls
Formulists
SodaHead - Ask or Answer Questions, Discuss News, Express Opinions, or Create Polls
Lists made easy + social + fun! - list.ly
SocialCompare - Collaborative Comparison Engine about everything to make decisions easier
Pligg CMS | Open Source Content Management System
ConvinceMe - Debate Online
loc.alize.us - Explore your world through everyone's eyes
Thinglink
Find the Best Twitter Apps for the iPhone, Blackberry, Web & More - oneforty
Your life, on the line - Plurk.com
Twitt(url)y - Real-time Link Tracking on Twitter
CrowdChess - The ultimate "wisdom of crowds" battlefield
Jaiku | Your Conversation
Personal Restaurant Recommendations | Restaurant Reviews | Foodio54.com
Socializr - Share events with your friends!
imagini
You Version
Mahalo.com: Human-powered Search
Clipmarks - Connecting people with information.
Lijit | Home
Geesee - Free chat for your website or blog!
Piczo
DOPPLR
뉴스게릴라들의 뉴스연대 - 오마이뉴스
Five Weeks To A Social Library | The first free, grassroots, completely online course devoted to teaching librarians about social software
Five Weeks To A Social Library | The first free, grassroots, completely online course devoted to teaching librarians about social software