Wilson vs. Hitchens
Though I only read parts of it, I thought that Pastor Doug Wilson did a masterful job debating atheist Christopher Hitchens (author of the recent book God is not Great, which argues that religion has been bad for the world). Wilson employs presuppositional apologetics with the rhetorical style of a C.S. Lewis. A great combo. Christianity Today hosted the debate, and my friend Joe Rigney sent me this PDF version.