I was looking for a podcast in the iTunes music store today, and stumbled across something really cool: iTunes U. It's a collection of academic programs from various colleges. Participating institutions include Stanford and U.C. Berkeley. All of the programs I looked at were free. I downloaded an 11-part course from Stanford on the historical Jesus.
If you have iTunes look for the iTunes U link in the left-hand column of the iTunes store home page. If you don't have iTunes check out http://www.apple.com/education/itunesu/.
Cool stuff!