Incomplete Imaginations

This (a widget that monitors a baby seat, and sets off a keychain alarm if the adult is away from it for more than six seconds while there's weight in the seat) looks like a really useful device. Rather, one hopes it never ever gets used, but it's a great thing to have in place. I'd love to see it built into every car seat sold, not mandated by law, but just because it's a Damned Fine Idea. If it saves even one child's life, it'd be worth it.