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?

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As a guess, either:

A) They include minimal PPC code in the installer so just in case somebody sticks it in their old PPC Mac and tries to install it. Showing a nice message is a lot more user friendly than just spitting the disk back out.

B) It's more economic just to have one installer, bundle PPC and Intel code on every disk and control what machine it installs on with a check against a file on the disk.

I've got no idea which one (if either) it is though [)] ]'>

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?

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http://68kmla.org/forums/viewtopic.php?t=3122

Basically, it's much easier to type a couple of Open Firmware commands rather than ripping, editing and re-burning an installer disk [] ]'>