There is a nice, long article in the LA Times about the OHS, Stanford's new ultra-rigorous online high school based on the high school classes they offer through EPGY. You can see the complete course schedule here.
We talked about enrolling Klaus in OHS last year but decided it would be better to invest the $12K tuition for college. Klaus' interest have skewed toward the soft sciences lately (anthropology, psychology) so that was probably the right idea for him. But from the article it sounds like OHS is an excellent program for the primarily math/science inclined.