Five years after the initial pilot of MIT's OpenCourseWare initiative, it's now making its way into secondary education with the launch this week of "Highlights for High School," which aims to bolster high school STEM education through free and open course materials, from complete curricula and syllabi to videos, lecture notes, and animations.
Right now, Highlights for High School has resources for AP Biology, Calculus, and Physics. There is a nice collection of physics video demonstrations and chemistry/physics labs. Good stuff and well organized.
And if MIT isn't enough of a challenge for teenage autodidacts, Open Culture has a list of other university courses online.