I decided to create an additional Debian repository, all the packages are from Lenny, but a little bit enhanced/patched.
deb http://www.sozial-inkompetent.de/debian/ lenny-enriched main non-free contrib
deb-src http://www.sozial-inkompetent.de/debian/ lenny-enriched main non-free contrib
For the start I have two Packages:
ion3
I just added mod_xinerama.
xserver-xorg-input-synaptics
In one of the zillion of Ubuntu-forums (I don't know which one anymore) I found a patch to have "VertMultiplier" and "HorizMultiplier" options to change the ratio of X and Y to have a more pleasant touchpad. I backported it to the version in Debian Lenny.
I use
Option "VertMultiplier" "60"
for my Lenovo IdeaPad S10e.