xMod – Hidden Tweaks For Leopard
xMod allows you to tweak all of those hidden settings in Leopard. xMod allows you to tweak everything from Finder to Safari, and if offer various other tools that allow you to tweak such things as the default screenshot behaviour and even check the status of you drive. The interface is a bit clunky but easy to use. Still beats doing all of these tweaks via command line 
Microsoft has a similar interface to this in Windows called “TweakUI”. Because not all of us are lucky enough to run a Leopard at home or at work.