How Stuff Work Podcast
On the way to work I have been listening to the How Stuff Work Podcast. There's plenty of topics to choose from and each Podcast last as long as my commute.
I started listening to them after downloading their new spoken word album, "Stuff You Should Know: Super Stuffed Guide to the Economy." Its a good hour long talk about how the economy works.
If you looking for an alternative to listening to the radio, I suggest trying the How Stuff Works Podcast. You can find them by searching for them in iTunes.