If you have a scroll wheel mouse and want to scroll faster in the Finder with it, hold the option key as you scroll. This will cause you to scroll by half a page per 'tick' of your wheel. This works with my Microsoft Intellimouse Explorer and I'm assuming it will work with all scroll wheel mice.
[Editor's note: Works fine with the Gateway Trekker Wheel Mouse on my G4/350 ... don't ask!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20011101120650419