Recently circulated on the HAS Email List, this self-education website contains ~80 videos that cover a variety of topics of interest to the amateur astronomer. Visit the site here: http://www.khanacademy.org/#cosmology-and-astronomy.

If you're feeling really ambitious, head over to MIT's OpenCourseware site. This site offers lecture notes, assignments and solutions from numerous MIT courses on Physics and Astronomy.

For other options, visit this blog post from www.marcandangel.com that has links to a dozen different self-education sites