Those who suffer from insecurity, here’s a great tool to allay those unfounded fears. The $600 World Tracker SMS is a GPS transmitter that sends SMSes to your cellphone along with the device’s coordinates for a monthly fee. When integrated with Google Earth, it can provide a photo location within 3 meters (!) of the tracking device.
Link: http://www.ubergizmo.com/15/archives/2006/01/world_tracker_sms_gps_transmitter.html
Very, very smart. I love it!