I like Lenswork Magazine's podcast. It's not really much of a podcast (most episodes are only like 5 minutes long or so), but I like it. Worth a listen.
I've done Lenswork and a couple others. The only one I can think of at the moment is TFTF-tips from the top floor. To me that was not worth keeping. I've gotten rid of all the photo podcasts. I do have two for photoshop though.