The theory and method of control used for the USB missile device can be applied to very complex devices such as the Xbox 360's Kinect (a special 3D camera add-on for the Xbox game console) as well.
Adafruit's website has a very interesting tutorial written by Limor Fried (also known as Ladyada) on how to analyze and investigate USB commands; access it at http://learn.adafruit.com/hacking-the-kinect.
This is well worth a look if you intend to reverse engineer other USB items. In this chapter, we have used Raspberry Pi to control remotely activated mains sockets, to send commands over serial connections from another computer, and to control the GPIO remotely. We have also used SPI to drive an 8 x 8 LED matrix display. ...
