[dbpokorny]

This is great, but it could be so much more. For example, you could split the project in 2 (or perhaps simply clone it) with the other half working on the K-12 market.

You see, this would be the ideal learning tool for a teacher-student tutoring situation: by looking for the precise point where a student becomes stuck, it is then possible to see what skill-set or knowledge area needs more work and practice, and then adjust the lesson plan accordingly.

Metacademy is of course the natural place for such a "market" in education products to form.