Pod Casts, etc

I find that working in my dyeing studio it would be nice to have something to listen to. I have thought about books on tape but a) they are expensive and b) there aren't too many books on tape that I am interested in that I haven't already read. But I hear that there are lots of good podcasts out there. Do you have a favorite? I am open to suggestions. Obviously knitting themed ones would interest me buy, surprisingly, I know, I do have interests outside the fiber world. Anyway, I'd love to hear your suggestions. Thanks.