Every year, the mercurial head of tech giant Apple seems to outdo himself with another eye-popping, paradigm-shifting product that refuels the brand's seemingly unstoppable line of highbrow gadgetry. In 2010, of course, it has been the iPad, which sold 1 million units within a month of its release and further cinched Apple's grip on the tech market — if not (yet) the media world. With iPad sales now outpacing Mac sales, and Apple threatening to do to online publishing what iTunes did to online music, Jobs' formula for the future of computing seems foolproof. Yet as Google and its mobile Android software pose bigger challenges to the iPhone's and iPad's dominance, Jobs knows he can't rest on his formidable laurels.