That's a change they've made, then - which is curious, because they made the opposite change in one of the other 10.5.x updates.
I don't think any PPC Macs can boot from GPT (although obviously I can't test all of them): I don't think Open Firmware was updated to recognize it...
GPT/GUID's advantage is known to Apple - obviously, they wouldn't be moving to it without reason - but apart from the BootCamp support, I'm not sure what exactly it might be. Perhaps it can support larger volumes... or is more flexible in other ways.
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--Dave Nanian
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