This will not be for everybody, but if you're a space nerd like me, you might like it: the 10th Annual Isaac Asimov Memorial Debate, sponsored by the American Museum of Natural History, moderated by Neil deGrasse Tyson, and featuring real experts:
Answering these critical questions were Kenneth Ford of the Institute for Human and Machine Cognition, Lester Lyles (ret) of the United States Air Force, Paul Spudis of the Lunar and Planetary Institute, Steven Squyres of Cornell University, and Robert Zubrin, founder of the Mars Society. Apollo 11 astronaut Buzz Aldrin made a surprise appearance at the end of the conversation after having listened to the debate. His comments were followed by a question and answer session with audience members and reporters.
It's about two hours long, but if your tastes are like mine, you'll think it was too short. (Okay, the Q&A part at the end was a bit tedious, and they needed the hook for Aldrin after a while, but other than that.) Visit the link above to listen, or right-click and save directly on this MP3 link.