OpenClassroom: Free video courses from Stanford University
This is not a comprehensive list of Stanford free course offerings. For example, it misses the Stanford EE Computer Systems Colloquium (EE380), http://ee380.stanford.edu.  The website has archive of videos going back to Fall 1996.EE380 is a colloquium not a course, but many of the videos will be of interest to HN readers.  In addition to the archived talks, which can be viewed on-demand, it's possible to watch the current (W4:15-5:30 Pacific) in a real time webcast or attend live in person.  A significant number of “not students” attend live because there’s always something that the camera misses and because you can ask questions.The talk this week (Oct 19, 2011) is Professor John P. Weyant, MS&E, Stanford speaking on Integrated Assessment of Climate Change: dealing with massive Complexity and Uncertainty.