Harvard University online courses

Harvard University Extension School offers a selection of online courses for free. Open to everyone (not just Harvard students), they're among the best free online courses we've seen. Each class is a series of online videos. You will not receive Harvard University course credit, nor a diploma for completing them; however, you do attain knowledge and that's its own reward, right? The classes:

• Intensive Introduction to Computer Science for free
• The Heroic and the Anti-Heroic in Classical Greek Civilization for free
• Bits: The Computer Science of Digital Information for free
• Shakespeare After All for free
• China: Traditions and Transformations for free
• World War and Society in the Twentieth Century: World War II for free
• Sets, Counting, and Probability for free
• Abstract Algebra for free