If you are looking for a list of locations to locate open course materials check out this post. After discussing Massive Online Open Course (as in MOOC) they post turns to Top Universities and Program - sharing some of the leading platforms today as well as partnerships with other universities and colleges.
It then goes on to share sources for open content:
* Libraries and Archives
* Databases and Search Engines
* Podcasts and Lectures
* Subscription Services
Chances are you may find a link or two (or more) to some open course materials you have not seen in the past.
Unfortunately (and not addressed in this post) a number of sites have posted that Flat World Knowledge will not be offering free textbooks beginning in January 2013. They were one of the first sites to offer open education resources. It appears that venture capital has come into play and may be a reason for this shift.
Via Beth Dichter