I used to put it on the right
and I'm right handed. I like to use as much of the screen real estate as possible, so I end up having the right scroll bar against the right side of the screen and then I end up fighting with the dock over whether it should come out when I mouse over the scroll area. It didn't take long for me to move the dock to the left side of the screen and now I'm much happier.
Have fun,
Carl Forde