For those who are interested in more C.S. Lewis audio, the Episcopal Media Center sells two collections of Lewis' BBC recordings: (1) C.S. Lewis Speaks His Mind (100 minutes on 2 CDs), where he discusses Charles Williams, The Pilgrim's Progress, The Great Divorce, and The Great Divide. (2) The Four Loves (2 hrs on 2 CDs)--the lectures that later became the book.
(HT: via Shaun Nolan)
Update: I originally had linked to some online samples from The Four Loves found here--but apparently they are not working. I'll leave the link in case they begin to work again.