How many copies of The God Delusion have been sold?
According to Wikipedia...
As of November 2009, the English version of The God Delusion had sold over 8.5 million copies and had been translated into 34 other languages.It was ranked #2 on the Amazon.com bestsellers' list in November 2006. In early December 2006, it reached #4 in the New York TimesHardcover Nonfiction Best Seller list after nine weeks on the list. It remained on the list for 51 weeks until 30 September 2007. It has attracted widespread commentary, with several books written in response.