Great! I might sight this in my construction. One future goal might be to add a voice component, a la Salman Khan (khanacademy.com) or Justin Lanier (http://www.youtube.com/watch?v=gDbyGgDCC5Q&feature=plcp).
This is so neat! I love how much you guys are teaching me about Geometry, I wish you had been my high school geometry teachers!
That's what I was thinking, Harry. I might create one.