Best of TED - Peter Norvig: The 100,000-student classroom

In the fall of 2011 Peter Norvig taught a class with Sebastian Thrun on artificial intelligence at Stanford attended by 175 students in situ -- and over 100,000 via an interactive webcast. An interesting speech if you want to learn more on how to attend free university courses online and how the education system is changing.
Worth checking also the following sites offering free university education open to everyone aand everywhere in the world.

Udacity: http://www.udacity.com/courses

EdX (MIT, Harvard, Berkeley) : https://www.edx.org/courses

Stanford: http://www.stanford.edu/online/courses/