I just discovered free video lectures on the Internet. While covering a wide variety of disciplines i am concentrating and linking to the economics lectures. I started watching Mark Thoma's Introduction to Econometric Lectures from Winter 2008 (University of Oregon). [His class web page is here and he blogs here.]
I think the lectures at freevideolectures could be very useful for many to brush up on something or learn it from scratch. Perhaps some of these could be linked from professor's course syllabuses.