I was happy to find "The Six Ways of Atheism" at my library. When I checked out this book, a young male librarian asked if I was doing a project for school (uh, it's summer time, meat head). I told him it was for my own personal self and the turned away with a disgusted look that was priceless! He didn't even say good-bye! As I walked away I told him this was a great book and that I recommend he reads it (of course I hadn't read it yet).
My two favorites are Dan Barker's Losing Faith in Faith and David Mills' Atheist Universe.