The Macintosh had been Apple's single largest source of revenue in nearly every year of its existence. But that appears to be a thing of the past: The iPod just barely outsold the Mac four years ago, and the iPhone's sales outpaced Mac for the first time last year. By a lot.
This year, the emergence of the iPad as an unexpectedly giant revenue stream threatens to make Mac just the third-largest sales driver for Apple.
Here's how Steve Jobs made Apple the most valuable technology company in the world.
