Electronic babysitter
Electronic babysitter
Idea Description
Taking small children into a crowded store is akin to herding cats. Amid the distractions of a supermarket or mall, it is easy to loose sight of them. The Babysitter, an electronic device that looks like a watch, is worn by both parent and child. The parent can set the distance on his/her watch determining how far the child can safely wander. As soon as the child wanders outside of that distance, the parent's watch emits a beeping sound alerting them to the fact that their child is wandering away.
What will you do if you win $10,000 for this idea?
Design and develop a working model of the Babysitter.
Vote for it now.

sounds like a good and sound idea ... are these not in existence yet? If not, it has to be a winner... I'd be down for one for sure.
Cool idea... but actually, this service already exists for many cell phones.