Personally I think the iBooks will get a G4 when the towers go to the 970 chip. But I think the current iBooks are rather durable and good machines, the 14" needs a resolution boost, but unlikely apple will do it any time soon. The 12" is a great form factor. The main problems with iBooks today is the 12" powerbook, as now it is another model that the ibook can not be at least equal to in performance or functionality due to apple's own rules. I expect the ibook to stay relatively unchanged for a while till they put g4's in them finally. Don't expect another size of ibooks, apple, i thought, had already learned their lesson of not offering too many models of one machine... but they did it again...