In reviewing Apple's contributions to computing, people tend to overlook the PowerBook, presumably because the first models were released during Jobs's absence. But it really was revolutionary, and turned the hulking ergonomic nightmares of the 80s into pretty much the form we have today. As a bonus, Apple also pioneered the use of the trackpad a few years later.

During the iPhone presentation, Jobs actually mentions the importance of the PowerBook in Apple's history. I always got a kick out of Jobs praising stuff from the Sculley era like the PowerBook and QuickTime, as it signaled that he recognized that Apple was bigger than him, and because Apple simply doesn't get enough credit for some of the stuff they did the "dark days".