I concur :-)

Assuming the iphone is based on OS X and knowing that it has motion sensors built in, then it will probably have the same API as the recent laptops in which case I predict the lightsaber sounds will be one of the first 3rd party efforts that comes out for the iphone...

Of course it'll have to be a safari based app with ajax so it'll be rubbish.

If you're interested in such things, check out
http://www.suitable.com/tools/seismac.html