Keeps your loose cable ends from falling down behind the desk, saving you from having to fish them back out with a coat hanger or enlist your kid and his small hands to grab them.

You may want to scale it up a tad if you intend to use the holes with #6 screws; right now, they'll take finishing nails.

Feel free to modify and repost.

1. Print 2a) Nail to desk 2b) Cut off flanges on end and use double-sided foam tape to stick it down.
2. Stick your cables in it.