The God Delusion was a pretty good book. I have been a huge Richard Dawkins fan ever since I read The Blind Watchmaker as a teenager.
You can watch Dawkins's TV documentary The Root of All Evil? online here:
http://huderon.blogspot.com/2006/12/...d-dawkins.html
A couple of other good books I would recommend are:
The End of Faith by Sam Harris
Breaking the Spell by Daniel Dennet
What is Good? by A. C. Grayling
Why I am Not a Christian by Bertrand Russell.