Small devices (about 1/4 of a credit card) that can be used as key holders or glued to any object (such as wallet, palm, ipod, etc.). These devices are like phones but can only receive incoming calls (ie they start ringing, vibrating, light up), they hold a sim card with a number. You call the number when you cannot find the object they are attached to.
If your keys accidentally fall behind the couch, all you have to do is call the number (saved in your phone contacts) and the key holder will illuminate and signal their position via sound.
The product would be avaliable in different colors & ring tones.
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This would prove to be interesting when the telemarketer (auto-dialer) calls when you are in a theater. . .
Its called a pager.
That is alot of expense just to find keys the two or three times a year they're misplaced. We already have devices where we push a button on a remote to make the receiver on the keychain beep. More useful would be if there was a way to get, say, GPS coordinates from it, or have a readout on our phone that tells us if we're getting hot or cold, for the tines when we can't hear it.