"Lost City of Barakus," leavened with the fun DK "Eyewitness: Shakespeare" book to get some flavor ideas for my homebrew. Next after that is "A Magical Medieval Society" (one of the last paperbacks, mwah ha ha!).
After that, a bunch of modules are looking at me forlornly, wondering when they're being moved from the "to be read" cabinet in the bathroom (yes, in the bathroom) to the "read" shelves in the study. The new "World of Darkness" book is giving me the same eyes, because it's not aware that it's just there so that I can read "Mage: The Awakening" without scratching my head over changed rules and such.
For non-game books, I just finished off the wonderful "Monstrous Regiment" by Terry Pratchett and am about to start on the revised "Don't Panic."