I just came across this site called talkingreef.com I found it in the podcast directory in i-tunes. It's a talk show 30mins-60mins long that covers different topics. I've only heard a few of them and they are very interesting. They have their mp3's on download at http://www.talkingreef.com/forums/podcast-episodes/ if you're interested. It's something to listen to on my hour drive to and from work.