Here's a talk given by Dr. Peter Kreeft at Iowa State University on February 20, 2010. If you go to the Veritas.org website, create an account and sign in, you can download the audio version.
Is there a God? How do we know? And how is it reasonable to believe in God given the evidence that the existence of evil provides. Join Dr. Peter Kreeft in a discussion of some of life's hardest questions, as he explores the rationality of belief in God.
UPDATE: I removed the links to Vimeo -- the site where you need to register and download is at Veritas.org, HERE.