Richard Feynman: The Douglas Robb Memorial Lectures
If you have never heard Feynman lecture on Physics, you are in for a treat. These are streaming Real Video files of Feynman lecturing at the University of Auckland, NZ. I must credit Timothy for providing me the link. I detest streaming media, especially from Real, but as Timothy chastised me once, "Beggars can't be choosers." These lectures are superb.