These days I listen to a lot of podcasts. I cycle to work and the podcasts help to distract me from traffic and make the ride more exciting. I pick up a lot of lectures from the LSE, the University of California TV system, Woodrow Wilson School, and Duke. I listen to some National Public Radio and Bloomberg and get the promo podcasts for a few magazines. I also download some science popularization but find these too hysterical to bare, so they are piling up unattended on my iTunes.
I would like to listen to more interview and roundtable discussion on history. The model I am looking for is Melvyn Bragg’s In Our Time on history, or Russ Roberts’s EconTalk on economics. Does any one have suggestions?
History of Economics Playground Redux 
http://thedispersalofdarwin.blogspot.com/2007/12/history-of-science-podcasts.html
not a podcast but should be good
http://www.thisamericanlife.org/Radio_Episode.aspx?sched=1285