With a rich set of over 1,000 new APIs, iPhone SDK for iPhone OS 3 provides an amazing range of technologies to enhance the functionality of iPhone and iPod touch applications. This book takes an introductory look at Objective-C and Cocoa before moving on to the tools youll use to create iPhone applications. Starting with common and tasks and UI elements, the book covers using tabs and tables, files and networking, the multi-touch display, and the built-in GPS hardware. This book will appeal to both current developers needing to understand and update their apps to the iPhone OS 3.0 and for those developers just starting out who need a complete tutorial and reference to the iPhone SDK 3.