I just upgraded my Mac Pro (Early 2008) with a new HD and went from Leopard to a clean install of Snow Leopard. I also installed all the latest software updates. Once I started using SL, I realized that the scrolling action of my Mighty Mouse is extremely slow. I cranked it up to max speed in the control panel, but it's still at best 1/2 of what I experienced in Leopard on the same machine when the setting was half way. When I plug the Might Mouse into my MacBook Pro running SL, it scrolls properly. The problem seems confined to the Mac Pro. Any ideas?