Yeah, right here:
"Please note that on-motherboard graphics cards (iMacs, eMacs, PowerBooks, iBooks) are not supported by the dumper tool."
Oh well, maybe PowerLogix will bring back their 900MHz chips someday and offer a video card replacement at the same time. Actually... that would be pretty cool, for - as we all know - the original iMac had the best design of any computer, ever.