I am also running an EEE PC 900a 4gb model and I'm facing similar
troubles. I tried loading up EasyPeasy 1.0 to try and find what the
difference between the drivers in Jaunty vs the custom 8.10 and it
seems that before I was using Synaptics drivers versus the elantech
drivers.
--
[Jaunty Beta]
in the X11 synaptics.fdi I changed "ALPS/2" to "ETPS/2 Elantech Touch"
and the problem was much better, but still present. It went from not
having any control over the touchpad to a manageable level of jumpy-ness
as long as you used a fair amount of pressure on the pad and full lifted
your finger
