Here is a cool tagging idea we got from Roni Chastain.  Roni uses dog tags for marking her gear. In an email to DIYP she explains: I must say that this is quite a lovely idea. I mean, there are services like Lenstag out there that will store your serial numbers digitally for you, but they don’t look half as nice. Yes, we know, this will not protect a camera from being stolen, but it will help it find its rightful owners should it get lost and found by an honest person.