MIT OpenCourseWare

I'm afraid that I've been punting this one for a long time now. No apologies for doing so again. This is seriously good stuff. (Academic speak).

From its beginnings in 2001, this radical initiative from the Massachusetts Institute of Technology (MIT) now has over 1800 courses freely available online forming a free and open educational resource for educators, students, and self-learners around the world. The eventual aim of the programme is to publish virtually all of MIT’s undergraduate and graduate courses by the end of 2008.
For more information and courses visit: http://ocw.mit.edu/index.html

Source: JISC RSC Scotland