How?

Just watched this video and was wondering if anybody knows how it's done.

Cool MacBook Pro Tricks | Vancouver Secrets

Using the sudden motion sensor.

There's a bunch of apps that let you use the SMS for other purposes, including one that let you switch tracks in itunes by slapping the sides of your screen.

Thanks. I'll have to search those out

There's also the ambient light sensor (when he places his hand over the keyboard)