The Pragmatic Bookshelf | Writing Your First iPhone Application
Now that the iPhone SDK has officially been released and the Apple App Store is open for business, it’s time to write killer mobile applications! To do that, you’ll need to use several powerful (and possibly unfamiliar) tools: Xcode, Interface Builder, Objective-C, and then the iPhone SDK itself. It can all be a little overwhelming at first. Learn how to write your first table-based iPhone application from Bill Dudney, an experienced iPhone developer.
The Pragmatic Bookshelf | Writing Your First iPhone Application