So here's another sample page of our upcoming The LEGO MINDSTORMS NXT Idea Book to water your mouths. ;-)
It's from the chapter that introduces the building and programming of a fully working slot machine.
Note that the book contains very detailed building instructions for each robot. In the case of the slot machine, it's more than 100 steps!
You will need not only two NXT bricks for this robot and five motors, but will also learn a lot from the programming instructions in terms of inter-brick communication.