The Digital Story with Derrick Story is a good one. The Inside Aperture Podcast is another. The Adobe Photoshop Lightroom is another as well as Inside Digital Photo and TV. I listen to them through iTunes.
There is a lot of stuff on Youtube too.
I like Radiant Vista, but I got kind of burned out on them. Too long and too monotone.
Check out the Light Source podcasts, if you skip past the almost commercial like tech talk at the beginning, you can get to some really really good interviews. They’ve interviewed some of my favorite photographers (Jeremy Cowart, Chase Jarvis, Lionel Deluy, Patrick Hoelck, Michael Muller, etc.). The get beyond toy talk and into thought process, work flow, influence and style. Really good stuff.