Faughnan's Tech: iMac essential: a thermal monitoring program
Let's assume Apple has fixed the power supply and the fans in the new (last month's) 2nd generation G5 iMac. They still have one huge problem -- IBM's CPU. In contrast to Intel, who invested wisely and heavily to destroy power-efficient competitive CPUs with their own excellent solution, IBM and AMD have followed the hot road.
So I don't think Apple has solved the G5 iMac's heat dissipation problem.
So if you want a G5 iMac, what else do you need? A well air conditioned room with an external fan pushing cool room air into the iMac's air intake. This kind of defeats the purpose of a quiet machine, but at least the room will be comfortable. One could compromise by running the iMac in its low speed setting and allowing the room temperature to rise a bit. A high quality large low speed external fan could even be fairly quiet.
My guess is that the combination of an internal thermal monitoring system, judicious use of external drives to reduce internal drive heating, lower performance settings, room air conditioning and a quiet external fan, all taken together, will allow one to use a 2nd generation G5 iMac for at least 2-3 years. When you need power for video editing, crank the external cooling and let the machine rip.
Yes, Apple has a problem.