Windows Phone 8 looks like a great mobile OS (despite the freaking stupid name), but they need apps, apps, apps. You won’t get Android or iOS users to jump ship unless they can get the apps they want or need.
What Apple has done with the App Store is something amazing and in most respects unprecedented. Before the App Store, there were apps for mobile devices, but things were clunky and developers and apps few and far between. Four years later everyone has an app store with varying degrees of success, and the app economy has been born. Go to MacStories and read the article, it’s a very nice piece.