Free online courses at Stanford - UC berkeley

OK, so I ran across some nice free online classes offered at Stanford. This semeser, the university offers the following free courses:

• Introduction to Databases: www.db-class.com
• Introduction to Artificial Intelligence: www.ai-class.com
• Machine Learning: www.ml-class.org
• Software Engineering for Software as a Service: https://www.saas-class.org/ ,
• Technology Entrepreneurship: https://www.venture-class.org/
• Human-Computer Interaction: https://www.hci-class.org/ 

Some classes have open registration, and some have a registration limit (like the db class).

I hope you find these resources useful :)