We talk a good deal here about free university courses and lectures, and mostly we end up talking about the humanities. But here's a good excuse to talk about the sciences, and particularly about computer science. A project started in Slovenia, Videolectures.net provides "free and open access of high quality video lectures presented by distinguished scholars and scientists at the most important and prominent events..." Among the most popular lectures, you'll find lectures along these lines: Fuzzy Logic, Where the Social Web Meets the Semantic Web, and an Interview with Tim Berners Lee. But, you'll also stumble upon a few non-scientific talks given by some well known names. Take for example Noam Chomsky (Force, law and the prospects of survival) and Umberto Eco (On The History of Ugliness).