In iPhone SDK: Developing iPad Applications, author Simon Allardice shows developers how to apply their existing knowledge of Xcode, Objective-C and the iPhone SDK to create applications for the iPad. The course focuses on what's different on the iPad, including design principles for the larger screen real estate, detecting device capabilities, and working with new Xcode project types. Exercise files accompany the course.
Understanding differences between the iPad and other devices
Using and upgrading existing iPhone applications for the iPad