Slantly
My old friends and colleagues at Internet Broadcasting launched an interesting new site today: Slantly.com. The idea is that you make claims (Wikipedia has a legitimate competitor in Google Knols, An Arrested Development movie would please me, etc.) and people vote on whether they agree or disagree with them. So it's basically Digg for opinions. (You have to vote to see other people's opinions, but even that feature is up for debate.) You can seemingly build a profile with various claims, which others will either support or deny. Clever -- and a nice surprise.