 Look out for the dreaded Digital Deadwalkers. They're not looking out for you. With faces pressed against their little handheld devices, they put all good citizens in harm's way. Hey, pal. Pardon you. The Digital Deadwalkers are multiplying. Until their behavior patterns can be modified, the American Academy of Orthopedic Surgeons warns all innocent people to stay alert. Better yet, to step up and speak out.