Many users of dual G4's who connect to the internet via the internal modem and PPP have been reporting repeatable kernel panics. In the "great news!" category, Darwin Developer Louis Gerbarg has created a modified Apple Serial driver that appears to have resolved the kernel panics!
You can read the thread about the original driver's problems and the solution on this MacNN Forum thread, and you can download the new driver here:
http://www.rpi.edu/~gerbal2/AppleSCCSerial.kext.tgz
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