So my previous rumination on the G5 in a PowerBook and the Mac Mini bears a little updating. On Monday, Apple announced new PowerBook G4s, showing the G4 processor still has plenty of life left in it as they bumped up the top speed to 1.67 GHz. CNET looks at the expected PowerBook G5:

The computer maker is well aware that Mac fans want a G5 PowerBook, and technically, the company could offer one now. But given the relatively power-hungry nature of the IBM PowerPC 970FX processor--Apple has dubbed the 970FX and its predecessor, the 970, "G5" chips--a G5 PowerBook would require compromises in size, weight and other aesthetics such as noise production. Apple, and likely most of its customers, wouldn't be willing to live with that. So while the G5 works in the iMac form factor, not so much in the PowerBook's. Which means not so much in a Mac Mini, perhaps not even within the possible timetable I outlined earlier. Which is why I'm not in the rumor business.