What is the best source for learning hacking and security.?

want to learn about hacking websites someand more thing like hackthissite.org challenges. im going to school in sept for computer security i just want a head start on learning. i want to be a ethical hacker ( pen tester) i have downloaded alot of cbt nugget videos such as CEH cert, but that is very basic i need someting i can really digg into a learn. i am running backtrack 4 R2 as my hacking OS and have 2 computers i can set up as web servers and test machines so im breaking the law. so far i know how to get past SSL, exploit computers with metasploit, nmap scanning cracking WEP, WPA, WPA2 and a few other things. I want to fill my head with more info.