Here's a link to 2 mp3s of a recent debate. (I think Ridgeback might like this one).
Info on the debate:
"In London's Westminster Central Hall on March 27, some 2,000 people turned out to hear Hitchens, Dawkins and philosopher A.C. Grayling debate a trio of religious authorities on the question "We'd be better off without Religion." (The motion carried, 1,205 to 778.)"
I listened to the debate (which was more a series of lectures from each party) and was impressed with some of the stuff from the theistic side. I thought they handled themselves quite well, spoke eloquently, and made some good points. Despite that I may ultimately agree with the atheist side of the issue (still unsure, though) I'm not sure the atheist side actually won in my view. Although most in the audience voted to carry the resolution ("We'd be better off without religion").
I was particularly impressed by the final speaker on the theistic side, Philosopher Roger Scruton.
You can get the audio links from Richard Dawkins' web page: