ozzman,
what pc do you have? for the 10.5.1 i had the same problem and used the ApplePS2Controller.kext posted here http://forum.insanelymac.com/index.php?showtopic=85960 . There is a good procedure on the post,
for installation method you can also follow this one http://forum.insanelymac.com/index.php?showtopic=85573&st=0 (very good)
I think that you only need to copy ApplePS2Controller.kext in the /System/Lybrary/Extension/ directory after installation.
Let me know.
let me know. I have Kernel panic and a yellow line saying "Failed to load extension com.orByte.driver.PCGenUSBEHCI."
Any help?