Brigham Young University Free Courses Geneaology courses (all levels), and more -- all free. No course credits. http://ce.byu.edu/is/site/special_offers/freecourses.dhtm
Carnegie Mellon Open Learning Initiative Courses include a number of innovative online instructional components. Credit and non-credit (free) available. Requires IE on Windows (bleah!). http://cmu.edu/oli/index.html
MIT OpenCourseWare With the publication of 700 courses, MIT OCW offers educational materials from over 33 academic disciplines and all five of MIT's schools. http://ocw.mit.edu/index.html