Someone just got this
trick works on all the uni body Mac Books and helps keep your wires and
cord under control.
This clip is especially bendy if you are lounging on the sofa with
the power-cord-side in towards the cushions. It keeps your MacBooks
power cord under control with this trick and to stop it from tugging in
you. Its built-in cable clip the one that keeps your cord wrapped around
the power brick and clip it to the side of your laptops screen.
The cable pulls it up off your lap and keeps it neat and tidy not to mention free of crazy fall across the keyboard loops.