The idea of a podcast seemed pretty dumb to me (girls are like that, you know) until I realized it could keep me distracted while I was sweating at the gym. There are a lot of cool science ones out there - here are some I recommend:
Periodic podcasts from the journal Science.
MicrobeWorld Radio, from the American Society for Mircobiology.
BioBits, from University of Utah.
I've gotta keep sharp if I'm going to go back to school someday.