Books
Tapworthy: Designing Great iPhone Apps by Josh Clark
http://www.amazon.com/Tapworthy-Designing-Great-iPhone-Apps/dp/1449381650/ref=sr_1_1?s=books&ie=UTF8&qid=1362995777&sr=1-1&keywords=Tapworthy%3A+Designing+Great+iPhone+Apps+by+Josh+Clark
A guide for designing iPhone apps
Overview
So you’ve got an idea for an iPhone app — along with everyone else on the planet. Set your app apart with elegant design, efficient usability, and a healthy dose of personality. This accessible, well-written guide shows you how to design exceptional user experiences for the iPhone and iPod Touch through practical principles and a rich collection of visual examples.
Whether you’re a designer, programmer, manager, or marketer, Tapworthy teaches you to “think iPhone” and helps you ask the right questions — and get the right answers — throughout the design process. You’ll explore how considerations of design, psychology, culture, ergonomics, and usability combine to create a tapworthy app. Along the way, you’ll get behind-the-scenes insights from the designers of apps like Facebook, USA Today, Twitterrific, and many others.