Free Online Courses from Top Universities

A lot of top universities in the world are now offering completely free high quality audio and/or video courses. Here is just a sample:

• MITx: MIT's online learning initiative. 
• MIT Open Courseware: freely available course materials from MIT. 
• Open Yale Courses: freely available video/audio courses from Yale.
• Berkeley Webcast: freely available video/audio recordings of courses from University of California Berkeley.
• Notre Dame Open Courseware: open courseware from the University of Notre Dame.
• Stanford Engineering Everywhere: a collection of free engineering courses from Stanford.
• UCLA Webcast: freely available video/audio courses from the University of California Los Angeles.
• Harvard Open Learning Initiative: freely available video/audio courses from Harvard.
• UCSD Podcast: freely available courses from the University of California San Diego.
• Oxford Podcast: freely available video/audio lectures from Oxford.
• Khan Academy: a website with over 3000 short videos (and counting) about everything from Math to Physics to History to Economics and Finance.
• Udacity: a collection of university-level free online courses in Computer Science in Engineering from Stanford professors.
• Coursera: a collection of free university-level online interactive classes from Stanford professors in various subjects including Computer Science, Electrical Engineering, ... etc.