Originally Posted by rolsbox
You may want to give "The Practice of System and Network Administration" a try. It covers the breadth of duties that most system administrators deal with. The 2nd edition just came out, btw.
I thought about recommending this, but wasn't sure if the OP was looking for just technical info. IMHO it's the most valuable IT-related book I've ever read, partly because it teaches concepts and good practice rather than being yet another book that shows you how to install Sendmail. I can't say enough good things about it.