Check out LinuxConfig.org it is a very nice wiki with alot of information about configuring a Linux system. Great for both newbies and old schoolers like me. The subjects covered are a bit advanced, so don't go there thinking you're gonna learn the basics. But, its a wiki! The point of a wiki is that people contribute! So as soon as I figure out what I want to contribute, I'll do it. Until then, you should just go check it out.