I keep seeing novel ideas for using the accelerometer in laptops like this Google Maps one but I'm still surprised I haven't seen anyone port games to talk to the device.
Seriously, if anyone knows the ins and outs of gaming applications like MAME, please make me a version that I can use to play Marble Madness on my macbook. I would kill for something fun like that, using a physical interface to interact with the game. I thought it would be a matter of days after the macbooks came out that someone would do it, but I haven't seen a game yet that interacts with the accelerometer.
update: sweet, thanks to some comments, there's an open source marble madness type app, in addition to the standard sensor app, making a tilt game possible. Here's a video I just shot of it in action: