Recently I had the opportunity (fueled by necessity) to play with and implement two electrical plugs remotely controlled through Raspberry Pi.
These particular products are from a company called Energenie, which makes energy saving devices. Seems they ended up making the Pi compatible module after the director of software from Raspberry Pi made them a suggestion.
I chose the starter kit, which contains two remote controlled electrical plugs and one wireless transmitter.
The Pi-Mote and plugs operate in 433mHz RF band and have an advertised range of 30 meters. In terms of functionality you have the traditional, manual ON/OFF switch and the cool, software controlled ON/OFF.