Become an App Inventor: The Official Guide from Mit App Inventor

"Have you ever wanted to build your own mobile apps? App Inventor, a free and revolutionary online program from MIT, lets you do just that. With the help of this companion guide, ... readers can learn how to create six different apps, including a working piano, a maze game, and even their own chat app to communicate with friends--then use what they've learned to build apps of their own imagination"--Publisher's website.