if multi-touch is as cool as it looks, i would love it if it would replace the mouse. imagine having a better touchpad that gave you multi-touch for your desktop? that would be very cool. a few gestures to shrink the screen and control windows more "intuitively" than the mouse.
If it happens once, it's a bug. If it happens twice, it's a feature. If it happens more than twice, it's a design philosophy.