Trap a thief and track your lost iPhone or iPod touch. When the thief gets hold of your iPhone, he would want to shut down your phone. If the POWER OFF app is on your main screen (preferably top left), the thief would try to power off the phone by pressing the icon. And immediately this app would be in action.
The app would list system messages as if it is shutting down all services of the iPhone. But internally it will send you an email with the GPS location of the iPhone.