Nice, done 10 of them so far. It's not teaching you to 'hack' as you'd expect (ie. breaking into things with malicious intent). Rather it teaches you things like learning how to read code, using the internet etc etc.
Another good site is www.hackthissite.org
It's a self proclaimed 'hackers playground' although like hackquest, it's mainly teaching the inner workings of the internet etc.
Also, theres a lot of good tutorials on coding etc.