Justin sends along this new take on luggage tags, aimed at making the TSA's job easier. He writes:
My mother gave me these luggage tags. She found them at Target on clearance for $1.98.
They're originally made by the folks at knockknock.biz, though I can't find them on their site anymore.
I'm pretty sure if you actually used these, it'd be a great way to guarantee that your luggage was searched and/or lost.