Apple has established the concept of the app store and continues to define the business model for competitors to follow. Mobile operating system platforms, at least those intended for smartphones, are more or less required to have some form of app store now, but enough is enough with 'there's an app for that'. How many apps do we need, exactly?
App Store boasts over 100,000 apps. Contrast that with the roughly 10,000 apps in the Android Market, or the approximately 1,000 apps available from Microsoft's Windows Marketplace for Mobile, and you can easily see that Apple is by far the leader in the app store arena.