Looks like they just put two touchpad sensors under the shell. Don't know how well it works though. Users probably have to get used to "click" the mouse withouth the feel of clicking. Maybe I can find one in the Apple Store or CompUSA (if they have it in stock and on display) to play around with and see how well it works
Putting a dot on the mouse for user to "rub" is a little too sexy for me.

If Microsoft steals Apple's idea and uses it on their S+arck mouse, Sen. Hilary Clinton might jump out and start rating computer peripherals.