As a math/visualization geek I'm smitten by this.
Loved this quote:
"I wasn't 100% sure whether other people would have the same a-ha moments that I've had, but I'm convinced more than ever that seeing math in motion is essential for honing our intuition about it. MathBox not only makes animated diagrams much easier to make and share, but it also opens the door to making them interactive in the future."
It's stuff like this that makes me pine for better WebGL support across the board.