I stumbled upon hackernotcracker.com a few weeks ago, and honestly believe it's one of the best sites I think I may have ever found as a Systems Administrator. They've got all sorts of nifty articles aimed at white-hatters...

The information provided there usually comes up with some nifty tools that you can download/use for your own information, and - of course - legal reasons. <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

Anyone else got any favorites?