I asked this before, but the truth is the iBook is faster -- probably because of the ram difference. Most people don't realize you can only stuff a 12"pb G4 1.5ghz with only 1.25gb ram. The iBook 14" 1.42ghz takes 1.5gb ram and it ran faster and cooler than the pb.
And what is the fan drain on the PB?
And what is the fan drain on the PB?