Comprehensive List of Free Online Classes and Online Courses
Lots of open courseware classes from different universities, sorted by subject. Nice to have an aggregated list from the various sources
The Educational Audio & Video Library | Open Culture
Collection of audio and video for education. Includes audio books, podcasts, music, selected YouTube videos, and university content
ZaidLearn: University Learning = OCW + OER = FREE!
Huge directory of links to free educational resources--open courseware, open educational resources, and general resources. Mostly higher ed.