When I'm down on all four underneath my computer desk, I hate not knowing what the cable I'm holding belongs to. I ran into that experience yesterday and it annoyed the crapola out of me. Did some quick Google searches and come up with the simply-named, Cable ID. The rubber helix shape allows you to wrap the Cable ID around the cord and then with a ballpoint pen you simply write what the cable is for in the space provided.

A pack of 8 differently colored ids will set you back about $7 at most stores.

Found at Sternform