Here is a piece of software that you may need in case you’re using Apple’s Mighty Mouse on a MacBook – I’m talking here about the bluetooth (wireless called by Apple) version. You may have observed if you switch from a Logitech mouse that tracking speed is slow and acceleration is almost useless. If you’re not a geek that will edit the /Library/Preferences files then I recommend you this software : SteerMouse available at http://www.apple.com/downloads/macosx/drivers/steermouse.html

Otherwise if you’re looking for a zero cost solution the easiest way is to open the Terminal and type:

open ~/Library/Preferences/.GlobalPreferences.plist

Once you’ve got the file open, changing the setting for com.apple.trackpad.scaling to something higher will make the trackpad more responsive. For example, a setting of 5 is noticeably faster than the fastest setting available in System Preferences, and a setting of 20 would be uncontrollably fast. You can also change com.apple.mouse.scaling to alter the speed of mouse tracking. 

apple's mighty mouse wireless version

The simplest way I knew of to commit these settings once I had altered and saved .GlobalPreferences.plist was to log out and log back in.