I've been listening to a bunch of different podcasts trying to find some that I actually look forward to listening to. One's that I enjoy are: Comics Geek Speak, iFanboy (their picks of the week one), The Comic Conspiracy (this is recorded by some of the guys who own a comic shop in the South Bay, CA), and finally Moms Read Comics by Comicosity. I especially love the latter because they generally have a special guest star which is someone from the comics industry, and it's always fun to hear them shed light on what they're working on, etc.
ComicVine has some podcasts too but I find that they can be a little too long for my taste.