U.C. Berkeley has been making many of its lectures available in downloadable audio and streaming video (that unfortunately requires the RealPlayer.) Now UCB is making its lectures available on YouTube, which is a more convenient format for many people.
Here is the first lecture from Physics 10: Physics for Future Presidents. Everyone should know this stuff even if you never plan on being President. The rest of the semester can be found in the YouTube playlist here.
Currently only 9 courses are available on YouTube, but that’s already 200 hours of video, and UCB promises to continue expanding this offering. Many more courses going back to 2001 are still available in the RealPlayer format.