I found this site, Philosophy Talk today.
Philosophy Talk is a radio show about philosophy (obviously) that is broadcast/webcast/podcast etc. from Stanford University. I still have to download realplayer so I can actually listen to their archive, but there seems to be some pretty good stuff here: eg a discussion on Intelligent Design with Daniel Dennett, Brian Leiter on Nietzsche, John Searle on Mind or Martha Nussbaum on Friendship. (Their blog is worth a look too).