Cover Flow is a technique that lets you browse and select album covers. Its used by iTunes and on the iPhone iPod player when the device is held horizontally.

It a gorgeous, visual and tactile technique that can have applicability in many places. Unfortunately, it is not part of the public SDK and can not be used without using private methods that are not allowed.

TeeHan+Lax have provided a great photoshop psd file for mocking up iPhone user interfaces.

I recently gave a short talk on creating clients that access web services in Objective-C. RESTful web services are incredibly useful and are more and more common everyday.

I'm frequently asked about resources and tutorials for learning to develop applications for the iPhone. There are a lot of books and tutorials out there. I've put together this list of some of the ones I use and recommend. Enjoy.

First up, definitely check out these four iPhone specific references from Apple's iPhone Developer Center

• iPhone Application Programming Guide
• iPhone Development Guide
• iPhone Human Interface Guidelines
• Your First iPhone Application

You'll spend a lot of time in Xcode and Interface Builder (IB) so also check these out.

• A Tour of Xcode
• Interface Builder User Guide