I have found myself in the position of temporarily commuting in my car for ~2.5 hours a day. My typical commuting activity - reading on the train or trying not to die while biking - is thus not an option. Neither is listening to NPR, which gets repetitive after about 20 minutes.

So: do any of you have preferred podcasts or audio classes that you have enjoyed? I'm looking for something interesting and informative but I'm not tied to a genre - the meatier the better. I suspect most of you have a decent handle on my interests. Any ideas? I've never really done the podcast thing so I'm having trouble knowing where to start.