Spying on your neighbors have never been easier thanks to the Rover Spy Tank ($150). This app-controlled gadget works with your iPad, iPhone, or iPod Touch and features a manually adjustable camera that streams live video and takes still photos, as well as a built-in microphone that transmit audio in real time. The Spy Tank even has a wireless range of up to 200 feet and an undetectable infrared night vision to see in the dark. [source]