This American Life
- The obvious choice.
Stuff You Missed in History Class
- A short (about 30 minutes) podcast on interesting people/events/phenomena in history.
BackStory with the American History Guys
- History podcast with three historians, each specializing in a different century of American history and discussing a weekly topic.
- Weekly reality TV podcast, mostly focusing on Survivor, Big Brother, and The Amazing Race. They often have great in-depth interviews with cast members.