Apple has had presence from the beginning thanks to iTunes and the iPod. Based on the sheer success of these two offerings, tossing in an application store while making sure the SDK for the iPhone/iPod Touch was accessible was largely a big reason why the app store has become a runaway success.
So just how popular has the app store been for Apple? How about 1.5 billion downloads with 65,000 applications available. By simply making sure that the barrier to development was very low along with allowing free apps in addition to the paid ones, Apple has been able to create something unmatched by anyone to date.
Will other competitors such as Blackberry among others make a dent in this? Not likely. Even with the Pre seeing success, I don’t think any other application store on a mobile device stands a prayer of seeing anything close to Apple’s numbers.