Here are my favorites:
- Cast-On with Brenda Dayne: Knitting and music--great voice, great tunes. Probably my favorite.
- Travel with Rick Steves: So much fun--travel the world with Rick. These are new all the time as well, unlike his shows on PBS I've seen a bazillion times.
- This American Life: NPR classic--great stories.
- How Stuff Works, Stuff You Should Know: Fun, entertaining--two friends chat about stuff.
- Betty in the Sky with a Suitcase: Flight attendant tells tales on travel and airplanes--very fun, and interspersed with music, which Lincoln likes a lot.
I will also add, that I love iTunes free single of the week and discovery download. I hit those up pretty much every week, and they are almost always gold.