How's this for a project for someone clever. A picaxe with a GPS and transmitter that fit's into onto a dog collar which transmits its position back to a reciever, so when your dog runs off you can find it easily. Could also be used with kids in shopping centers or attach it to cars or motorbikes to find them if they're stolen (depending on the range of the device), Could even work through the mobile phone service maybe.
Anyone?