Stanford University offered three of their most popular computer science courses to the public this fall, online for free. The courses were so popular that Stanford’s doing it again in January. This time they’re offering 7 computer science courses:

Computer Science 101 http://www.cs101-class.org/
Machine Learning (one of the offerings this past fall) http://jan2012.ml-class.org/
Software as a Service http://www.saas-class.org/
Human-Computer Interaction http://www.hci-class.org/
Natural Language Processing http://www.nlp-class.org/
Game Theory http://www.game-theory-class.org/
Probabilistic Graphical Models http://www.pgm-class.org/
Cryptography http://www.crypto-class.org/

And two entrepreneurship courses:

The Lean Launchpad http://www.launchpad-class.org/
Technology Entrepreneurship http://www.venture-class.org/

No tuition, no textbooks, no set class times (students get a week to complete the assignments). The only downside is that you probably don’t have time to do them all!