
So pretty much, it's a big ball with 3 arms connected to a smaller ball with 4 buttons on the top. You grab the little ball (

It not only lets you move stuff in 3D, but it has really strong force feedback and stuff too. For example, in Half Life 2, when you fire the SMG or get hit by a combine, it really pushes your hand. And if you pick up something light, like a box, it'll move easily, but if you pick up a car with the grav gun, it'll be pretty tough to aim correctly. It really creates a whole new experience.
Oh yeah, and you can swap out the little ball for other attachments, such as the pistol one below.
Vids?
CNET Vid
Pistol grip attachment
TigerDirect Video
I want to see some moar games that support this, because I'll for sure be getting this eventually.