Calling all Linux users: The Linux Foundation saw the successful I’m a Mac commercials and Microsoft’s versions with Jerry Seinfeld and wants to make its own version. To do so, the foundation is holding a video contest to try to showcase what Linux means to those who use it. There’s a certain beauty to this David versus Goliath type contest: Just as Linux goes up against rivals Apple and Microsoft all the time, so too, will its user community who develops these commercials go up against the big dollars that