I have one. Strange thing is that ever since Apple released "Mighty Mouse" my mouse has been acting extremely quirky. (It may have also been the new security update as I installed it around the same time.) It is MUCH more sensative. Sometimes it registers a mouse-click as a double mouse-click causing programs to execute or folders to open. Other times when I'm moving the mouse it will jump from one side of the screen to the other. It is possible it's a coincidence (though I don't believe in coincidences). Am I the only one having this problem? If not, how can the problem be resolved? I've tried MacMice's mouse driver and I'ver also tried USB Overdrive to no effect. I've repaired permissions too.