Jay Walker, the guy who founded the Priceline online bargain site, has a new idea. He wants to set up Web cams around the nation's 47,000 power plants, airports and other critical infrastructure facilities. Then everyday Americans, paid $10 an hour, would monitor the cameras and report suspicious activities to the government. He calls his idea USHomeGuard and envisions a "Citizen Corps... composed of ordinary citizens who serve their countryworking from home over any Internet connection." Skeptics abound, and many are snickering loudly. But Walker's already stated signing up volunteers on his Web site.