Webcast.berkeley is the campus service for recording and publishing course and campus events for students and learners around the globe. Audio and video recordings of class lectures and special events are processed and made available to eve...
Open Yale Courses provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University.
I've listened to two of the biology courses, Metabolic Biochem with Randolph Hampton and the Cell Biology course with Yimin Zhou. The lectures are top-notch and are helpful even without seeing their in-class powerpoint presentation. Occasionally there are technical issues, however, but that's to be expected when podcasting so many courses so often.