In 1964, Feynman delivered a series of seven, hour-long lectures at Cornell University. Those lectures were recorded by the BBC, and in 2009 (with a little help from Bill Gates), they were released to the public. You'll find all seven of them featured below, but you'll also want to check out the lectures on Microsoft's Project Tuva, where they have been carefully edited to include closed captioning and annotations.

http://io9.com/5894600/watch-a-series-of-seven-brilliant-lectures-by-richard-feynman