I'm returning that Russell book I just bought today, I got to reading it....and fuck - I just don't like the writing style at all. It's not a slow read at all, it just doesn't...well...grab my attention (which is a real shame, seeing as I enjoyed the first 20 pages) before I bought it).
I've read a lot of criticisms about the book too, one of these being the section on Kant (and a few other sections); apparently he makes a lot of mistakes and misconstrues most of Kant's concepts, as a bonus he then shrugs off whatever he doesn't feel like elaborating on. Since I'm no Kantian, or even bothered to learn much about his philosophy (I hate Kant's style of writing), I'm really at a loss for words and facts at the moment.
I'll probably get one of those newfangled atheist books from Harris, Dennet, Dawkins, or Hitchens. I've also heard good thins about A Short History of Nearly Everything by Bill Bryson...still not sure what I'm going to get though.