It is probably a fact that you will lose your iPhone some day. It is good to know that there are several ways of finding it back. Of course being lucky is one of them but if you have a Mobile Me subscription it gets a whole lot easier.
Check out this dude as he hunts down his iPhone & iPad!
Now Apple also released an App today that you can install on any other iPhone or iPad and use it with your Mobile Me credentials to find your lost darling on the move.