So, I'm watching Myth Busters and noodling around on the Internet while waiting for my laundry .. and I find Jyte.com. It's based on an idea that's about as simple as simple gets: you make a claim ("Myth Busters is awesome.") and people vote yes or no.
What makes it compelling is that it's easy find and socialize with people who share your opinions. Throw in OpenID for buzzword compliance, and a light weight reputation system, and it's a pretty cool little application.