Best Selling Books on Atheism

I am often asked to recommend decent books on atheism, and while it has been awhile since I read one, I remain comfortable recommending these books as a great place to start for people just beginning to explore atheism. I also like to check with Amazon.com periodically to see what their best selling books on atheism are.

Excluding the Kindle-only titles, Amazon.com's ten best selling books in atheism are currently as follows:
  1. The God Delusion
  2. The God Argument: The Case against Religion and for Humanism
  3. The Portable Atheist: Essential Readings for the Nonbeliever
  4. Religion for Atheists: A Non-believer's Guide to the Uses of Religion
  5. Letter to a Christian Nation
  6. God and the Atom
  7. Godless: How an Evangelical Preacher Became One of America's Leading Atheists
  8. Christianity Before Christ
  9. The God Virus: How religion infects our lives and culture
  10. Atheism For Dummies
This looks like a great mix of the old standards and some new ones that sound interesting. I may have to pick up a couple of the ones I haven't read yet in case I have any more time to read this summer than what I'm expecting.

Update: For the most current list of best sellers, see Current Amazon Best Sellers on Atheism.