I listen to a few:
-PokerWire Radio Podcast -- Hosts Joe Stapleton, Joe Sebok, and Gavin Smith. It is usually pretty light-hearted and entertaining, and with Gavin and Sebok being pretty successful live pros, they are always there to offer interesting stories and give great advice and an in-depth look at a lot of the major tournaments that are going on. They also have a lot of good guests, such as Phil Ivey, Phil Hellmuth, Howard Lederer and Allen Cunningham all within the past few weeks.
-PocketFives.com Podcast -- includes a rundown of the past week in online tournament play and offers very interesting interviews with some of the top online professionals every week.
- ESPN Poker Edge Podcast -- I've only listened to this a few times, it was decent from what I've heard, but I can only take so much of Phil Gordon at a time.
Hope this helps a bit.