State of Belief - Air America Radio Podcast
This is probably my favorite Podcast that I've come across so far. It's not specifically Christian - its host is Rev. Welton Gaddy (sp?), the President of the Interfaith Alliance - but rather a sort of religion news program...it gives a liberal/progressive/inclusive look into the general religious issues we're facing today as well as the specific issues that come up each week, and often has really interesting guests. Each episode is about 35 minutes long. If you can't find the actual program on your radio, or it comes on at a bad time for you, I'd strongly recommend this Podcast!