OS 10.1 adds an option in the General prefs to have double-scroll arrows at the bottom of the scroll bar. Scott R. wrote in with a quick preferences hack to enable double-scroll arrows at BOTH ends of the scroll bars. If you'd like to enable this feature, simply start a terminal session and type:
defaults write "Apple Global Domain" AppleScrollBarVariant DoubleBothYou then need to logout and login (or, perhaps, simply force quit the Finder) to see the effect ... but once you've done so, you should have double-scroll arrows at both ends of your scroll bars.
defaults write "Apple Global Domain" AppleScrollBarVariant Single(or you could just open the General pane in the System Prefs and check "At top and bottom") or
defaults write "Apple Global Domain" AppleScrollBarVariant DoubleMaxto put them together only at the bottom (again, this is equivalent to clicking "Together" in the General prefs panel for scroll arrows).
Mac OS X Hints
http://hints.macworld.com/article.php?story=20010927011840284