Increase sensitivity of Trackpad?
The setting in System Preferences changes the com.apple.trackpad.scaling key in ~/Library/Preferences/.GlobalPreferences. You can also edit it manually:

defaults write -g com.apple.trackpad.scaling -float 5.0


The normal minimum and maximum values are 0.0 and 3.0. You have to log out and back in to apply the changes. Moving the slider in System Preferences resets the setting.