It’s the ultimate plug-’n’-play nanny-cam. The Vue personal video network lets users place cordless cameras virtually anywhere and view video in real time on the Web. A small gateway plugs into a router and syncs up the system’s two cameras and the Internet, no downloading or configuration required. Installation takes less than a minute. The system relies on a secure, low-power wireless network that allows the cameras to operate for up to a year on a single lithium-ion battery.