Speaking of podcasts, the two guys at TheCommute.org drive to and from work together. They record their conversations each way, and then podcast them. They call themselves Voice one and Voice two. Voice one explains the concept:
Most days I get a lift to work with Voice two. We talk in a way that two people in a car would talk. We constantly refer to things that you will not know about or understand. We also talk about things we read in the news, saw on the web, heard on the radio. It really is as exciting as it sounds.