This is a favorite ice-breaker question: dead or alive, who would you like to eat lunch with? My all time favorite probably would be C.S. Lewis.
Over at Between Two Worlds, this link was posted. It has some audio clips of C.S. Lewis talking. I love all things British--afternoon tea, English accents, even Mr. Bean, but I was not expecting Lewis to sound the way he did. Perhaps his books are more powerful than his voice (which reminds me that delivery is important, but content is crucial).
FYI...not all the links on the page worked for me. The BBC radio address was enjoyable.