Academic Earth
Described by TechCrunch as “Hulu for Education”, Academic Earth catalogs videos of talks and lectures given at some of America’s leading universities on a huge array of subjects. There are also a large number of complete courses available.
You can hear people like Jeffrey Sachs talk on the Future of Globalization, or Larry Brilliant lecture on Strategic Philanthropy, or John Doerr speak on How to Negotiate Valuations. Fantastic resource.