You can buy Fooling Houdini: Magicians, Mentalists, Math Geeks, and the Hidden Powers of the Mind on Amazon.com. You can learn more about the book at the Fooling Houdini website.
Below is a clip of author Alex Stone talking about the book and the art of Magic.
UPDATE: This book is receiving a justifiably hostile reception from magicians for revealing secrets. To read about the time Houdini himself got in trouble over breaking the Magician's Code, read: Houdini, the Magician's Code, and the Talking Tea Kettle scandal.