Headaches: Multifold. Apple is still a pip-squeak to the Wintel Goliath. With less than 10 percent of the computer market, Apple needs to lure more software makers into producing programs for the Mac. The company has cut about as much as it can. Now it has a tougher job: Make sales grow. And what's the follow-up? Jobs probably also hasn't been spending as much as he should on research and development. Finally, where is his successor? Pixar, a collegial place, can run without him--but what about Apple? Not a good place for a boss who refuses to remove the "interim" prefix from his CEO title