Um...kps...I don't think it's legal to have the same version of Panther on both the G5, you're going to buy and your PowerBook. So, if you want to use if on your PowerBook, I guess you'll end up with having to buy Panther after all.
Dear me...did I say that?....ummm, I'm allowed a backup, no?...yeah that's it...I'm backing it up to the 12" PB...yeah...
As I said above, "famous last words", I'll probably relent and order. It's far too easy with "one-click".