It looks like the next book in the recent series of atheist books has arrived. It's called "Irreligion," by John Allen Paulos, and there's a review in the NYT Books section. I haven't read it so I can't comment yet, but it seems what distinguishes this one from those of Dawkins, Hitchens, etc. is that the author is a mathematician, and uses probability and other mathematical concepts to make his arguments.
There's also a link on the Times website to the book's first chapter.
If anyone's read it, share your review here!