Light Messaging

From the Silicon Valley Biz Ink and the Globe and Mail comes a story about the new Nokia 3220 Camera Phone: Light Fever, a phone that has LEDs that you can use to write on the air by waving the phone back and forth. You can also tilt the phone to get a joystick effect for certain games.
Is Light Messaging a gimmick or could it become a way of displaying information without large screens? Could this technique be used for other situations?