Plastic doodad keeps cables from falling behind desk

Nifty piece of plastic keeps computer cables from falling behind your desk. I wonder if there's an easy way to make something like this from plastic that most people throw awa

For sheer bang-for-the-buck, these cord management cards are tough to beat. They're cheap polyethylene sheets you either stick or screw to the edge of your desk and then snap the cables coming from your computer and peripherals into the recesses. I was tired of picking my iPod connector off the floor when it would fall off my desktop. With this, the ends of the cables are kept at the ready on your desk, which is especially great for stuff you are regularly plugging and unplugging. You can also use it to neatly route other cables coming from the back of a PC tower, like speaker and ethernet, which really helps cut down cable clutter.