I just tried the above solution to get the touchpad on my NC10 working, I never bothered before as I prefer to plug in a mouse. As it happens, the four lines that were added were the ones that caused it not to work properly, without them it worked nicely!
Option "LeftEdge" "120"
Option "RightEdge" "830"
Option "TopEdge" "120"
Option "BottomEdge" "650"
Yes - when I left them in, the whole touchpad became a scrolling device but did not move the mouse pointer.