Dan Saffer at Kicker Studio has an excellent explanation for "Why you want (but won't like) a Minority-Report-style interface." Gestural interfaces have had "cool" factor since that movie featured them - and since then, can't seem to be mentioned without invoking its name. But "cool" and "useful" are two very different things - and gestural interfaces fail pretty badly at the latter. They're flaky, imprecise, have poor feedback, and after only a few minutes of use lead to an achy condition called "Gorilla Arm." I admit that they have some wonderful applications for gaming, but those are game-specific; for general computer interfaces, the existing tools we've had for years (mouse, trackpad, buttons everywhere) are just more efficient and useful. Gestural interfaces may be cool for now - but once that fades, we'll all be back to more efficient interactions. Save the gestural stuff for gaming!