This could prove both nifty and useful.
Per Electronista, display maker Display maker AOC has begun shipping its USB-powered e2251Fwu monitor that was introduced last June. The 21.5-inch, 1080p LED monitor gets both signal and power through a USB 2.0 connection, making it ideal for use as a secondary display. The monitor is just 10.6mm thick, sports a detachable stand, has a 5ms response time, a 250cd/m2 brightness, a 1,000:1 dynamic contrast ratio, and supports Windows and Max OS X operating systems.
The unit is priced at US$200 and is immediately available.