Horace Dediu has a look at iTunes growth after Apple reported its earnings. I’ve long held that it’s the ecosystem that Apple’s competitors can’t easily copy. The company was very stealthy in the early 2000s in building the infrastructure for what we have now with the App Store, music and video delivery. It all just syncs and works—that’s what consumers want to happen. I’m not saying it doesn’t need work, but even as it sits, Apple’s ecosystem is pretty remarkable.