Dropcam, makers of the Echo wireless camera home monitoring system we had a chance to review earlier, has now shipped what it calls the smallest HD Wi-Fi video monitoring camera. The Dropcam HD is paired with a free Android (free, Google Play) or iOS (free, App Store) app that lets users see what it sees from wherever they are, as well as through any browser. It offers 720p video quality and is powered through a USB port.