Eric Guth 4Z1UG interviews an interesting ham each week for about an hour. These podcasts have been a source of education and inspiration to me. I am learning that the Ham Radio universe is much larger than I thought. Now I am working my way through the 150+ episodes already in the archives.
I recommend these particularly if you are wondering what to do next in the hobby. You can pick these up through iTunes or STITCHER. However, I have been downloading them from the podcast list. I spend at least three hours a week driving, and these podcasts have made the drive enjoyable.