Lifehacker.com had an article on "free courses" available online. Not all are "courses" in the traditional sense - you get materials but there are no instructors or mentors. They are a good source of self-paced instruction and a good way to look at what other instructors and schools are offering.
When classes at MIT were first offered as part of their Open CourseWare (OCW) project, it encouraged other schools to do the same - but there were others on this list that were doing it before MIT too.
The Open University's OpenLearn website has free and open educational resources for learners and educators around the world.
Now that Apple has a number of iTunes U schools, you can go to sites like Berkeley's iTunes U and download course materials (iPod not required).
- University of Pennsylvania online library
- Didn't get into an Ivy? Try online lectures from Princeton.
- Carnegie Mellon University offers Biology, Causal Reasoning, Statistics, and more
- Languages? Portland State University: Swedish and Hungarian or an Italian language and culture course from Brooklyn College, California State's Conversational Mandarin Chinese or Turkish from the University of Arizona.
- University of Washington's
free online courses; Greek mythology, American Revolution, Heroic
- economics at the University of Nebraska.
- sign language from Michigan State University
- Brigham Young University offers independent study in subjects such as Family History, Family Life, and Religious Scripture Study.
- Stanford University's free CS education library
- Not courses but many offerings from the Library of Congress can be used in courses or as supplementary material, as well as offerings from Annenberg Media's videos on many subjects.
- And send your students to read the core documents of American democracy
- Learn something about theology at Covenant Seminary
- Some free online math courses at Whatcom Community College
- Health courses from the Johns Hopkins Bloomberg School of Public Health
- Bioterrorism from the University of North Carolina.
- Free online math textbooks, videos, and lecture notes from New York University
- Tufts University's OCW open courses on dentistry, medicine, nutrition, and more.
- Cognitive science from Hampshire College