I would love to see something similar to this, but with math. Something like those flowcharts, drawing on a drawing tablet, and snapping to a grid or something like that. Automatically recognizing square root, division, and othet math symbols. Maybe even some character recognition for drawing the numbers (though text boxes would be nice too).

Math always just seemed like one of those things that should be doable on a computer, but you just can't really do it efficiently without being able to draw numbers, lines, and other stuff all over the place, like you can on paper.