Before you pack up the car and head out on summer's ritual road trip, here are my recommendations for what to put on your iPod for the journey. I love podcasts, and there are a few to which I am addicted.
First and foremost there is Stuff You Should Know. I love these guys. Josh and Chuck are hilarious and explain, in terms you can understand, some of the coolest stuff in the world. Literally, it's stuff you should know. And they do good things, too. I'm on their Kiva team, and you should be, too.
Stuff You Missed In History Class is also from the good people at HowStuffWorks.com. These ladies are very smart and will have you, if not actually reading histories, then vowing to at some later date. The podcasts about the Tudors and the Stuarts are particular favorites.
Radiolab from WNYC is totally cool, sort of like This American Life's cooler younger brother. Here is a little video that goes along with their podcast called, Words.
You can literally download hours and hours of these for free, and maybe learn something while you're at it! Go figure.