MIT OpenCourseWare -- "a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity."
MERLOT: Multimedia Educational Resource for Learning & Online Teaching -- "a leading edge, user-centered, searchable collection of peer reviewed and selected higher education, online learning materials, catalogued by registered members and a set of faculty development support services."
Selective Bibliography of On-Demand Academic Public Lectures -- "This selective bibliography provides access to and information about university and other web sites in the United States offering online, on-demand public lectures."
"...more than 14.6 million items...
Open Educational Resources Commons-- "Find Free-to-Use Teaching and Learning Content from around the World. Organize K-12 Lessons, College Courses, and more."
The Orange Grove "is an online library of free instructional resources for Florida's educators."