I was recently at a friend's house using his Dell Laptop, and was turned on to a really cool thing.
On some Dell laptops the extreme right of the trackpad is active to do scrolling for the active document.
Basically, all you have to do is put you finger on the extreme right and move it up and down to have the active doc scoll up and down...no click is needed and the mouse can be anywhere on the page.
Really cool. Does anyone know of a Mac Utility that can do this on PBs???