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This is a collection of some of Stanford's most classical and popular courses.
What can I say, you don't have to pay a penny to study in a Stanford course :P

http://tw.youtube.com/user/stanforduniversity?ob=4

Stanford is amazing. Other that the clips provided on youtube, another site, called SCPD, provides recorded videos of even more courses which are being given this year. So if two of the classes you choose have a conflict, just SCPD one of them! Watch it online! What's more, you don't have to go all around the huge campus to Audit classes you're interested in. Audit them on SCPD, if you're an enrolled student, it totally free!