I think this has also been mentioned on here somewhere, but what you have is an OEM license. That disc is licensed for use only on the machine it came with. In other words, you can only use it on that particular 20" iMac and on no other computer.

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You're not paying attention. He said it came packed with an Intel Mac but boots on a G4. If there is PPC code on there and it boots, there may be a way to trick the installer into putting it on the hard drive. The big question is, why did Apple put PPC code on an install disc that shouldn't support PPC code at all?

As for the Leopard install on slow G4's, I never heard of a firmware hack. The way I read about involves finding the CPU speed checker and changing it to a slower speed to fool the installer into thinking it is a supported machine. Why would you screw around with the firmware when all you have to do is change a few bytes on the install disc?