I've done some reading in several homebrew forums, but as far as any extended reading, I would probably just recommend the standard literature:
How to Brew by Palmer
or, if you prefer: Joy of Homebrewing by Papazian
Either is a good comprehensive overview of homebrewing; read 'em both, but I'm a Palmer man, myself.
From there, I'd suggest:
Clone Brews by Szamatulski(s)
Designing Great Beers by Daniels
I've found the former instructive, but I've actually brewed more of the clones listed in HBT's Recipes section.
I got Designing Great Beers for Christmas, but I'm not ready for that stage yet, and maybe never.....