Nowadays, you can track just about any object you can slap a GPS transmitter on -- cars, bikes, motorcycles, kids, dogs, you name it. If you want to protect your car in case it's stolen, just install a tracking device in the trunk. Worried about your newly licensed teen driver? There are GPS devices out there -- some that can be linked to your cell phones -- that will monitor his or her speed and location (and even alert you when the car enters an unapproved location). You can also mount a camera on the dashboard that will allow you to monitor your teen's every move while he or she is in the car. And don't forget about Fido -- the dog can even get in on the act when you attach a tiny GPS monitor to his collar.