Fun discussion at the New York Public Library in May 2007: Christopher Hitchens vs. Al Sharpton on Atheism and God – The Full Debate. Great fun, though Sharpton – who actually is rather sharp – sidesteppes the issue a little. Most fun (and there are many to choose from) comment was Hitchens saying that the best defence for religion is that it "domesticates our need for ritual".
Anyway, 89 minutes of intelligent repartee for when what is on regular TV just is too hard to bear.