I produced a math podcast "dansmathcast" from 2005-08 that is still up on iTunes, in the Education category, with 33 episodes so far.

It's like a math variety show, with a chapter-of-the-week, mathematics for the masses, math or myth, an advanced topic, and other features, capped off with a math joke. Listen to dansmathcast; in a half hour you'll be smarter!

See if you like it here or subscribe on iTunes (and feel free to add me to your list!)

Dan Bach the Math Jock