CES 2008: Pocketfinder Personal Location Device
The Pocketfinder is a small personal GPS. It's purpose is to help parents keep track of their children when playing or even someone with down syndrome, Alzheimer's or autism. Heck, you could even use this device to keep track of a valuable asset if your wanted as it's only about the size of an oreo.
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Not only can you locate the Pocketfinder at any given time, you can set up safe zones/areas and the Pocketfinder will alert you if it goes out of your set boundaries. It's waterproof and virtually indestructible and I think it's a wonderful idea.
It'll cost you around $100 plus the online service fees but really what price wouldn't you pay for the safety of your children?