Here's a list of top 10 podcasts. I'm already fan of the top two - Bloggingheads.tv and Slate's Political Gabfest as well as the Economist's on this list. I'm interested in checking out some of the others.
I also like BBC 4 In Our Time - which covers history, philosophy, culture, religion and science.
BBC History Magazine
"BBC History Magazine’s podcast comes out each month, featuring interviews with notable historians talking about topics ranging from crusading knights, Tudor swimming, or the D-Day landings." It's so British. And really cool.
and Sounds True Insight's at the Edge Interviews with leading spiritual teachers and writers about their latest challenges—the "leading edge" of their work. I always learn a lot and her questions are good.
A friend told me the Monocle podcasts are also good. Any one try them?