http://boingboing.net/2012/12/03/bluetooth-stickers-help-you-fi.html heres another article i didnt get to post first though...
i think this is just the beginning of this sort of tech. perhaps it will be built into discs in the future and each manufacturer will have thier own app for finding discs in the field.
i think if the size and price drops as technology tends to do, we should be seeing these more often in the future.