Jayson Franklin has a fun Catholic Podcast called The Catholic Cast. In his latest podcast he interviews David Bawden aka Pope Michael I. This is a very interesting interview that shows that "Pope Michael I" is a very nice but deluded man. Victor Lams has also composed some theme music for Jayson which is pretty good.
Jayson previously had elicited names for his podcast when he considered changing the name of his show. I had suggested to him “Pod Casti Connubii” in honor of Pius XI encyclical.
You can find other Catholic Podcasts available at Disciples with Microphones. Personally I am waiting for Fr. Sibley to come out with a PODcast in which each week he details the latest sighting o Pious Overly-Devotional(POD) behavior. Though he has been making available MP3s of his homilies (which are excellent and delivered in the manner of Fr. Corapi).
If you are unfamiliar with the term Podcasting then information is available here.