Actually, I don't think all of the courses are available through OCW. I recently tried to find all the course for the Computer Science bachelor's degree plan and found all but one: http://www.gliffy.com/publish/3280755/

On top of this, many of the course are just lecture notes. My experience has been that the lecture notes aren't much better than a good e-book.

I'm really excited for the OCW Scholar program (http://ocw.mit.edu/courses/ocw-scholar/) to expand more, as they offer screencasts, problem sets, and the rest of a fully automated learning package.