I listen to podcasts at work. I listen to every episode of the following:
The Read (started listening after Gene Demby recommended it on Pop Culture Happy Hour - went back and listened through their entire archive in about a week. I am obsessed.)
EHG
Throwing Shade
PCHH
How Did This Get Made?
The Rachel Maddow Show
Real Time w/ Bill Maher
Best of the Left
I listen to a bunch of others occasionally. The B.S. Report, Ask Me Another, Stuff You Missed in History Class, My History Can Beat Up Your Politics, History Chicks, Wait Wait... Don't Tell Me!, Stuff You Should Know...