Have you been paging through a document and wished that the scroll arrows were at both ends of the scroll bar? With a simple Terminal hack, you can have it your way. Just open Terminal.app (Applications > Utilities) and type in the following command:
defaults write "Apple Global Domain" AppleScrollBarVariant DoubleBoth
You will need to restart your Mac to see the changes. If you want to change the scroll bars back to the normal way, just open the Appearance System Preference pane and select "Together" from the "Place scroll arrows section."
For more tips and tricks like this, visit TUAW's Terminal Tips and Mac 101 sections.