How important is the iPhone to Apple's business going forward? See the chart above, prepared by Fortune. Up from 5.7% in 2008 to 18.5% in 2009.
We're going to say "very" and "increasingly". Daring Fireball highlights how Apple goes about ensuring that "increasingly" part, riffing off The Loop's reminder of when Apple killed the iPod mini at the hight of its popularity and replaced it with the iPod nano:
You know who thinks the iPhone 3GS stinks? Steve Jobs. No one is working harder on an “iPhone 3GS killer” than Apple.