Who says disposable cameras are a waste? Matthew McVickar taped a one to a piece of cardboard, and shipped it off to his friend in Hawaii. The cardboard also included instructions for Postal Workers to take pictures on the journey, and posted the results on flickr.
Double whammy because you get to see behind the scenes at USPS!
PS - more super cool uses for disposable cameras over on Photojojo. Now I want to pick one up! Do you ever use disposable - or even film - cameras anymore?