Cross posted...
According to the Apple website, the Mightly Mouse supports the standard usb mouse driver in Windows 2000 and Windows XP. No mention of Windows Vista beta.
The tracking sensor on the bottom of the mouse uses the same Aglient LED tracking mechanism that 90% of optical mice currently use.
I personally love my Logitech MX900 (Bluetooth wireless) on my PowerBook G4 and desktop PCs. But I will give the new Apple Mighty Mouse a try. From what I understand, the "clicking" sensors actually look for a change in finger contact surface area... push down and you have more fingerprint touching the surface and it registers as a click (or click and hold)... so you should be able to reposition your hand without causing false clicks. The scroll ball sounds similar in that it's touch sensitive not an actual trackball.
My guess is that Apple had someone from their iPod division use the iPod clickwheel technology to make a plastic touch sensitive mouse. Very similar to the old Apple LCD moinitors with the plasic bezels... to turn those monitors (and the attached computer) on you just touched the plastic surface covering the power LED... no mechanical switch or feedback.
I do have some questions about this mouse:
-- Can I adjust the touch sensitivity of the virtual buttons somehow? Maybe a special sensitivity pane in the Mouse preference panel on OS X?
-- Is there a way to disable to adjust the volume of the "click" speaker inside the mouse?
-- Where the #$%& is the Bluetooth version?