Academic Earth - Free video lectures from top universities

Academic Earth is an organization founded with the goal of giving everyone on earth access to a world class education. They are building a user-friendly educational ecosystem that will give internet users around the world the ability to easily find, interact with, and learn from full video courses and lectures from the world’s leading scholars. Their goal is to bring the best content together in one place and create an environment in which that content is remarkably easy to use and where user contributions make existing content increasingly valuable.

They currently have videos from Berkeley, Harvard, MIT, Princeton, Stanford and Yale. The subjects of the courses are varied and many. Some of the subjects are Astronomy, Biology, Chemistry, ComputerScience, Economics, Engineering, English, Entrepreneurship and History.