I'm reading The God Delusion by Richard Dawkins - good stuff. I love that his primary argument tactic consists of ridiculing people who believe in God. That takes balls, man - I think every Atheist I know would like to employ that very same tactic, but fears ostracization or at least some very dirty looks...
This link was posted in the book - incredibly funny stuff:
Over 300 "Proofs" of the Existence of God.