Baggini, Julian. Atheism: A Short Introduction. Oxford University Press, 2003.

Harbour, Daniel. An Intelligent Person's Guide to Atheism. Duckworth Publishers, 2001.

Russell, Bertrand. Why I Am Not a Christian. Touchstone, 1957.

Links/Websites:

The Top Ten Atheist Myths
Church of Ultimate Naked Truth
Theocracy Watch
Free Thought Radio
Atheists for Human Rights
Active Atheism
The Atheism Fanlisting
Atheism Online
Atheistic Forum
The Secular Web
Atheism Info (on Secular Web)
American Atheists

Disclaimer/note: I have read the books and recommend them. I haven't extensively read all of the websites, so if anyone comes across anything that is unsavory about any of the sites, please let me know. Also, if you have any sites or books to add, please email me: atheist [at] sneakingunder.com Thank you.