I saw this on Slashdot and I figured I'd repost it here, but it's a driver allowing two-finger scrolling like the newer Powerbooks on many of the older models. here's the link
http://www-users.kawo2.rwth-aachen.de/~razzfazz/
http://www-users.kawo2.rwth-aachen.de/~razzfazz/