I'm afraid you cannot run that display with that PowerBook. It unfortunately only has a regular DVI port instead of the Dual-Link DVI port needed to run the 30" Cinema Display.
Surely you can find another constructive use for such an awesome monitor anyway? 🙂
Yep. The 5,6's (15", and both 1.5GHz and 1.67GHz) came with the 64MB and DVI standard, with the dual-link port option available with the 128MB upgrade. The 17" 5,7's came with 128MB card as standard, with the dual-link port.