I'm starting amass a considerable collection of power tools : drills, saws, etc. and need a tried & true way of marking or labeling the tools for easy identification. I always have a couple people at my house working with me or doing a trade for me. It is so easy to get tools mixed up. One other aspect of labeling would be a stealth labeling for theft recovery such as having identification engraved on the inside of the plastic cover or something like that. Of course I could paint everything with florescent pink or such but I'm guessing people have already thought this through and come up with a good solution for people with a large, diverse collection of tools/appliances.