This is one of the best power socket ideas I've seen in a long while: A socket with an extension cord inside the wall itself. They should make these standard everywhere. I even like the name: The Rambler Socket.
It works easily: Pinch the sockets sides, pull it out, and use with your electrical thingamajig. Once your are done, tug the wire gently, and let the recoil mechanism neatly store away the extension cable. Power socket people of the world: Make it happen. [Yanko Design]