This document discusses Apple's App Store business model. It explains that the App Store allows iPhone, iPod Touch, and iPad users to browse and download apps developed for the iPhone SDK. Developers can sell apps or offer them for free download directly to devices. The document then outlines how Apple's business model works, including its strong products that drive volume downloads, revenue sharing structure with developers, and how each user contributes revenue through multiple app downloads on average. Finally, it provides considerations for how Shuttle could build its own app store, including development, hosting options, payment processing, and marketing requirements.