I have installed familiar linux (0.8.4) on an IPAQ 3900, with the Opie user interface.
I messed up the touchscreen calibration and had a very hard time fixing it.
If anybody ever has this problem (and it is reported occasionally on the net), you can get things (approximately)
working using my machine calibration data. Replace the file
called /etc/pointercal with this data:
24271 -110 -1037464 -228 17819 -808152 65536
Maybe this will help somebody, somewhere avoid the hassle I had.