As of this posting, there is a Slashdot link to an article about Stanford offering free CS and Robotics courses online, so I thought I would preserve it if some people don't check out Slashdot that much.
Here's the direct link to Stanford's site about it:
http://see.stanford.edu/default.aspx (http://see.stanford.edu/default.aspx)
MIT has a similar offering, and has been continuously updating their course catalog for a couple years now.
http://ocw.mit.edu/OcwWeb/web/home/home/index.htm
Both these Universities, along with several others (such as CS lectures from Berkeley) all have lectures on iTunes U. http://www.apple.com/itunes/whatson/itunesu.html
I guess these don't count as credits towards any degree?