My work-buddy Chris just showed me Try2Hack site. It's a very non-invasive test-your-hacking-skills site. I reached level 4 of 9 within 5 mins :) So I guess I'm pretty good. I wanna hack the rest REALLY soon! Let's see if I'm good enuf or not. The best thing is, this is not the illegal hacking. However you need a LOT of skills to get past the 6-7th levels.