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Dave--
I did a little experiment. Even though I don't have Intel macs, I partitioned my external Firewire as a GUID partition table. This let me format partitions 1 & 2 as osx journaled and partition 3 as ms-dos (FAT32?). I've now backed up all three computers. (By the way, if I can find something as slick as the SD for XP, my life would be much easier.) Anyway, my G4, again, was the last of the PPC breed. It came out about 3 months before the Intel macs (darn it!), but came with the higher resolution screen. I can boot my backup and my wife's backup on that computer. My wife's G4 was the next to last before Intel. Basically same machine (mostly) with the obvious difference of a lower res screen. I cannot boot any backup to her machine.
So I have two choices. Go APM and boot both macs, but no XP backup (unless I find a solution to APM and MBR existing on same drive), or leave GUID and forgo booting on her machine. Her's is about to go in for out-of-warranty repair (again, darn it!), so your SD is very timely. At least she can still use her stuff off of my machine.
Thought I'd just pass this along. However the OpenFirmware works that you mentioned, it sounds like they must have made a change right before the switch-over to Intels. Again, for what it's worth.
Cheers!
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