UC Berkeley is making available a significant number of lectures in the form of a webcast/podcast through webcast.berkeley. The recordings were aimed originally for Berkeley students to help them review key concepts and to study before exams. We have to commend though the visionaries and the faculty at UC Berkeley for making the lectures available to the world freely as open content.
The list of courses is amazing. Whether you want to brush up on general astronomy or listen in on the western civilization class you missed in college, this is a great resource. Thank you MIT for Open CourseWare. Thank you UC Berkeley for webcast.berkeley. Where are Harvard, Yale, Princeton, ....?