Check it out.
List of OpenCourseWare
I've used MIT's OpenCourseWare multiple times in the past few years and liked it a lot. Which is why I was particularly happy to stumble across this article on the life-hacking site Marc and Angel. It has a long list of university OpenCourseWare sites *as well* as a fairly long and exhaustive list of other online educational resources, from Duke's Law Center for the Public Domain to Google's Code University to Science.gov.