Seeing as we're all pretty sure that there'll be no G5 any time soon, what's the likelihood that Apple moved the iMac to the G4 to increase the numbers of G4s they buy from Motorola so that they can sufficiently lower the G4 processor cost-per-unit to be able to ship quad G4s at a price that pros won't balk at? A policy like this [which might have been conceived at the end of last year, for instance] would have by now have had the time to trickle through, seeing as Apple can't make enough iMacs for the demand that exists, which would suggest that such an increase in the numbers of G4s used by Apple would by now have lowered their purchase cost. Pursuing this thinking one step further: we know that the iBook has generally been a good seller for Apple, with laptops comprising a high percentage of computers shipped. With the numbers of G3s now being used in the Gamecube, it would be reasonable to think that the G3 market cost would be very low, so Apple might be willing to sacrifice some of its margin on Powermacs because it can make up this deficit with increased iBook margins, which might explain why the iBook hasn't moved to G4 yet. There are a lot of 'ifs' in this business model, but I think it suggests a quad G4 as a strong possibility, even if this would mean a quad-1GHz machine alongside a dual 1.2 or 1.4, similar to what Apple did in the dual-800MHz days.