I mentioned in August 2011 that Stanford started offering free university courses online for free. It's really exciting to see this trend spreading, most notably with the creation of edx.org which is a project launched in 2012 by some of the top American Universities. If you're looking at a move into computer science or programming, here's a list of free, university level computer classes starting this month. The same person who built this list has created a website called Class Central that lists many free Massive open online courses (MOOC) in all subject areas.
Here's the list I've compiled so far, which seems to be the most definitive as of writing this:
If you know any other aggregators I can add, let me know!