Tile: The Tiny Tracker That's Perfect for Absent-Minded Gadget Lovers
"Tile, which began its life last summer as a very successful Kickstarter campaign, will help in both cases. This small, square-ish device can be placed in, or affixed to, any item you want to keep tabs on. It will attach to a keyring, sit in a wallet, or stick to just about anything—from a laptop to luggage. Using a Bluetooth LE signal and a companion app on your iPhone or iPad, you’re then able to track your item’s whereabouts."