Innovating Beyond Apple's Design Standards, While Maintaining Apple's Logic for Consistency, Clarity, and Usability -- Tweetie -- Facebook -- Using App Connectivity with Core Location to Make Games Social -- Topple 2 -- Q&A: Foursquare -- Using Compression to Cram More Data into a Local App-Large Images, Geo Data, and Lots of It -- AccuTerra -- Q&A: Exit Strategy NYC -- Creating a Beautiful App Without Falling Victim to Memory Issues-OpenGL, Skinning, Object Reuse, and Coding Efficiently -- Postage -- Q&A: Delicious Library -- Fitting a Big Idea into a Small Space-Keeping the Feature List Focused, Simple, Refined, and Compelling -- Wooden Labyrinth 3D -- Q&A: Prowl -- Making Better Apps and Enfranchising Your Users -The Right Way to Iterate, Planning an App Store Strategy, and Some Serious iPhone Development Philosophy -- User Experience: Ge Wang -- Iterative Design -- Upgrading.