The directive was simple, short — and classic Steve Jobs. The zealous CEO of Apple Computer had instructed his mobile products marketing group to come back with a new PowerBook. It could not be the lightest, most powerful or most affordable PowerBook — oh, no — it had to be “the best notebook in the world.” That is arguable, but the resulting Titanium PowerBook G4 is easily the coolest notebook anywhere. More from Mobile Computing Online’s “Mobile Innovators of 2001: Best Notebook” feature.