Academic Earth (http://www.academicearth.org)
Berkeley Webcast (http://webcast.berkeley.edu/)
Flat World Knowledge (http://www.flatworldknowledge.com)
Free Technology Academy (http://ftacademy.org/)
Internet Archive: OERs (http://www.archive.org/details/education)
Provided by the Internet Archive library, hundreds of free courses, video lectures, and supplemental materials from universities in the United States and China. Many of these lectures are available for download.
Khan Academy (http://www.khanacademy.org/)
Notre Dame Open Courseware (http://ocw.nd.edu/)
Open Courseware Consortium (http://www.ocwconsortium.org)
Open Yale (http://oyc.yale.edu/)
OER Blogs (http://oerblogs.org)
An online wiki-based collection of over two thousand open-content textbooks. Fully editable, published under the Creative Commons Attribution-Share Alike License.
Another wiki-based resource containing thousands of open educational resources on the university level.
A free online computational knowledge engine. Highly useful for complex queries, high level mathematical computation, and statistical comparisons.
World Digital Library (http://www.wdl.org/en/)
The American Library Association's guide to fair use and its limitations.