From The New York Times:
However, Mr. Gates, who is also well known for his sharp and varied intellectual interests and his philanthropic commitment to education, said this week that he had purchased the rights to videos of seven lectures that Dr. Feynman gave at Cornell University called “The Character of Physical Law,” in an effort to make them broadly available via the Internet.
Microsoft Research announced on Wednesday that Mr. Gates, who purchased the rights to the videos privately from the Feynman estate, BBC and from Cornell University, in cooperation with Curtis Wong, a Microsoft researcher, has created a Web site that is intended to enhance the videos by annotating them with related digital content.
Note you will need to download Microsoft's Silverlight to get around the site. When you access the site, you will get prompted to download it automatically.