I like it already, and am already working on the xcode badge. Curious: what's the business model?
When you click the "Sign Up" link it takes you there. Either $25/month or $40/month. The cheapest you can get away with is $300/year.
I know I am getting tired of using "free" services that actually aren't free at all when you factor in the time I have to use to really extract value from them.
I am just hoping Treehouse actually provides a service that makes a difference, i.e. someone can learn faster and more efficiently with Treehouse than some other way.
So far this looks good. Can't wait to try it out later tonight.
[1] http://thinkvitamin.com/asides/guess-this-badge-and-win-a-fr...
Either way, a great idea looking forward to seeing more material soon!