Home-monitoring cameras are a multimillion-dollar industry, yet most are not consumer-friendly. They force users to deal with IP addresses or tweak a complex series of computer settings, and then subscribe to a paid monitoring service separately. Dropcam is easier and cheaper. To set it up, users need only plug the camera into a USB port once; the Dropcam automatically figures out network settings from there. Users also get a free account from which they can view a live feed from any computer, tablet, or mobile device. $149