I'm a newly hatched podcast junkie.
This American Life. The "Continental Breakup" one from a few weeks ago was excellent, and should be required listening for all global citizens.
Front Row Weekly
All Things Considered
Nerdist, specifically the episode where he interviews David Tennant
Suggestions gladly taken!
Fair warning: I like geek-slanted podcasts that I can listen to while walking to and from the train. I'm not shy about laughing out loud while walking along by myself.