Holey Moley -- Helping learners visualize fractions

The problem: learners often have a difficult time understanding what "1/3" *looks like*.
The concept: make the process of visualizing and then adding fractions the strategy for winning a game
The pitch: Holey Moley -- Players role a ball around picking up parts of a whole, getting a point only when they make a whole ball. If they go over the whole, they start a new ball.
The approach: create a working prototype, then a Flash-based version of the game to sell others on the idea, test with learners, and ultimately hope to port to the iPod.