Hi. I recenlty finished O'Reilly's Running Linux, and Linux Network Administrator's Guide. I'm looking for something that will help take me into the next level. I don't imagine I can find what I'm looking for in one book (although, hope springs eternal); but, I was wondering if some one out there could give me a couple of recommendations for a (or some) good book(s) to read next. There's so much out there, it's some times difficult to find things that are worth while (without spending hours and hours plodding through 500 page books).