"the biggest difference between the 15" and the 12" in this go-around is that the 15" has backlit keys" ... I'd say the biggest difference is really the screen real estate, though. 
and powermac: My 'early' PowerBook 150 had 2.5 hours out of a battery. More in direct sunlight, as you could then turn off the backlighting. With an (also 'early') PowerBook 540, I could get about 6 hours of work-time, as it had two battery slots. I wish somebody would make current battery technology available to, say, a PowerBook 180. That would make one great typewriter nowadays.
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