"So it's almost uncanny that Jobs, nearly ten years from the day the PowerBook 2400 first saw light, will revitalize Apple's footprint in the sub-notebook sector with a petite MacBook that promises to be everything a modern day 2400 should be, and much, much more. (Ironically, it also took the company nearly a decade to introduce a notebook that was more compact than the original PowerBook 100. The Titanium PowerBook G4 introduced in 2001 measured 127 cubic inches compared to the PowerBook 100's 168.)"
http://www.appleinsider.com/article.php?id=2500
http://www.appleinsider.com/article.php?id=2500