On my QuickSilver, which came with 10.0.4 I think (not 10.1), it did have iDVD for Mac OS X. I don't even have a dvd-r/dvd-rw. I can read dvd's, and write cdr's.
What is interesting, is that when I installed the 10.1 update (which was free at the apple store - apple rocks), it removed the idvd application from my system. Its completely gone.
I'm guessing I could crack open the software restore cd and re-install it...
Still, if you pay mucho dinero para una G4 con el dvd burner, you might expect a $20 software package to be installed. $20 is a great deal for dvd creation software, but honestly, if apple charges $600 for the dvd burner, why not charge $620 and include idvd for os9 and osx?
(yeah, and if you are going to spend $600 for a dvd burner, why not spend $20 more on the software.... I guess apple might have origionally charged $50 and split the difference.... dah dah dah... confusion..)