Thought I'd share this for those who haven't seen it already...this is really awesome if you've always wanted your Mac's mouse to behave like a PC mouse. http://osxdaily.com/2010/06/02/kill-os-x-mouse-acceleration-from-the-command-line/#comments It's easy to do and easily reversible simply by messing with the tracking slider in System Prefs. In a terminal: Code: $ curl -O http://ktwit.net/code/killmouseaccel Code: $ chmod +x killmouseaccel Code: $ ./killmouseaccel mouse And voilà!! Your mouse now behaves like a PC mouse, free from crappy acceleration. Personally, I prefer the acceleration I get from MagicPrefs to this. But it's still cool. Best of all, it's free!