Seth Godin makes the argument that it is not how hard you work, but how much hard work you do.
Today, working hard is about taking apparent risk. Not a crazy risk like betting the entire company on an untested product. No, an apparent risk: something that the competition ( and your coworkers ) believe is unsafe but that you realize is far more conservative than sticking with the status quo.
Richard Branson doesn't work more hours than you do. Neither does Steve Ballmer or Carly Fiorina. Robyn Waters, the woman who revolutionized what Target sells — and helped the company trounce Kmart — probably worked fewer hours than you do in an average week.
None of the people who are racking up amazing success stories and creating cool stuff are doing it just by working more hours than you are. And I hate to say it, but they're not smarter than you either. They're succeeding by doing hard work.