The reason this is so impressive is that it brings together three technologies that people aren't used to even seeing one good implementation of yet: * HTML5 accelerometer support * Sync between mobile/desktop using websockets * Web page slicing based (by the look of it) on DOM and image processing …and of course this is in a nice responsive WebGL-rendered package, which people are getting more used to thanks to the…
* Battery
Lot's of it on my iPhone. But it's worth it :-)