Have you used Maintenance since? Does it all work normally again? Sometimes machines just panic randomly (but not often, as you've noticed) but there's no associated long term problem. Hopefully this is the case for you.
i was once installing this iscroll2 driver using the command line, and part of the installation process required me to unload the current trackpad driver before installing the new one. the manual clearly said that you cant touch the trackpad while the driver is unloaded but i was like i wonder what would happen if i did. and there it was a kernel panic.
i think it is some kind of sudo command in the terminal that you will have to type to get it working (or not working in this case)