BBC is a publicly-supported news service in the UK and, as such, it provides a good deal of educational material in fulfillment of its mission. I recently came across the section of their site on the Human Body and Mind. It is well worth browsing through, although the layout is a bit confusing. The animation of the human auditory system is the best I've seen (requires Flash).
PS. In case you have kids of your own or work with them, the BBC web site also has lots of math and reading exercises (games) for kids and several are quite good. Try this link to start.
PPS. If you are into astronomy, their Sky at Night television series is quite good. You can watch it online and see other information here.