For my money (or lack thereof), it's hard to listen to anything better than Dr. Peter Kreeft. That's why I've scoured the internet for everything of his I can find. So far, my section SPEAKER: Peter Kreeft has about 50 of his talks linked and I'm always looking for more.

Here's a perennial favorite: The Existence of God. If you've never before been exposed to Dr. Kreeft's work, buckle your seatbelt.