Ebook: Head First iPhone Development covers iPhone 3.1 SDK ; a brain-friendly guide

Getting started : going mobileiPhone app patterns : hello @twitter -- Objective-C for the iPhone : Twitter needs variety -- Multiple views : a table with a view -- Plists and modal views : refining your app -- Saving, editing, and sorting data : everyone's an editor -- Tab bars and core data : enterprise apps -- Migrating and optimizing with core data : things are changing -- Camera, map kit, and core location : proof in the real world -- Leftovers : the top 6 things (we didn't cover) -- Preparing your app for distribution : get ready for the app store.