Info on loading podcasts on iPhones:
Here is a thread on what podcasts people like:
Some of the ones I like, all of which are free on iTunes:
Catholic Stuff You Should Know - fun, enjoyable podcasts by seminarians out of Denver on Catholic theology, history, culture, apologetics, etc. 15 - 20 minutes.
Catholic in a Small Town - weekly podcast by a young Catholic couple about the day-to-day lives as Catholics in a small town in the South.
The Catholic Laboratory - An English podcasts about Catholicism and science - famous Catholic scientists and their achievements, the intersection between Catholicism and science, etc.
Catholic Movie Reviews - aimed at teenagers and young adults, but I enjoy it, too. Short (5 minute) reviews of new film releases with a Catholic perspective.
Catholic Perspective on Paul - 11-part series on St. Paul and his epistles.
EWTN Audio Library
EWTN: Sunday Night Live, with the always interesting Fr.Bernard Groeschel.
Excuse Me, Ghidorah - Interesting podcast on Catholicism and Popular Culture - if you're a sci-fi fan who also likes Flannery O'Connor, Tolkien, and the philosophical works of Dr. Peter Kreeft, this is a podcast for you.
www.peterkreeft.com (type that in on the iTunes search field)- Speaking of Dr. Kreeft... He's a professor of Philosophy at Boston College, an acknowledged expert on St. Thomas Aquinas, and always fascinating to listen to, these are some of the lectures he has done on different topics.
Hope this gives you some ideas.