Car alarms didn't stop thieves from shattering the window of Gerald Levinson's Porsche and stealing his radio. So the ex-publisher of Chief Executive magazine and ex-ad manager at Institutional Investor invented RadioGard, a fake front showing splayed wires and a gashed frame. Attached with Velcro, it creates the illusion that the real radio has already been ripped off. Levinson sells it by mail from his Manhattan Beach, Calif., home.

-- Leslie Brokaw