More clever uses for a camera

Here's a follow-up to last week's post about clever uses for a digital camera. Among more suggestions from PC World readers were photographing pre-existing damage to rental cars, photographing public maps in foreign cities, making a record of your luggage on flights, keeping a record of your passport, and recording stages of work when dismantling things for repair, so no pieces get left out when you try to put it back together (I really like that one).