[driverdan]

"Watch videos and take tests"

Am I missing something? That's your learning method? Nothing interactive? No coding? Videos may be a fine way of understanding a process but it's not good for something as in-depth as coding. You don't learn code by watching videos of others doing it, you learn by coding.

The site design is nice but you'd need to offer a lot more than videos to get me to sign up.

[ryancarson]

We have something called Code Challenges. They require you to code (using an in-browser engine) and pass challenges.

[jimrhoskins]

Several of the videos include Code Challenges, which test your knowledge by writing real code in the browser. We are going to be expanding this tool throughout Treehouse to offer more opportunities to code-along as well as take challenges.

[breathesalt]

I think this site is targeting the youtube generation--nothing wrong with that. I personally would prefer to see higher caliber technical books enter the market. However, it seems the acclaim here concerns more the site design than the service itself.