The art of h@xxor-ing

Discovered a few websites the other day, in which they permit and encourage you to hack their website/server in order to learn about the world of hacking... legally. I have to say, I got caught up into one called Hack This Site. They actually give you lessons and challenges as to how to hack their website using different methods. And when you get stuck on a challenge, you can always refer to the forums, and ask others for help or tips. Quite intriguing and may I suggest it to all you "noobs" out there.