Argonaut Industries is revolutionizing the field of throwable electronics with the G Ball.
The G Ball is a Nerf-style soccer ball studded with lights which respond to the motion of the ball. When held in your hand, the lights are yellow on the top of the ball, green on the bottom, regardless of how you rotate the ball. When the ball is in free-fall (flying through the air, for instance), the lights turn blue. When the ball experiences a sudden acceleration (when being thrown or caught), the lights flash red.
The G Ball includes a lithum rechargeable battery, and can be recharged over a USB connection.