Here's another gadget that I wished I had inverted -- it's simply called Cordgo, and in a way that is what is does (or enables you to do).
A one hand-operated cord adjustment and storage accessory, Cordgo's durable, lightweight design fits in the palm of your hand to deliver cord control.
No more dangling iPod cords, cell phone cords, MP3 player cords; in fact, any cord up to 3mm in diameter.
Cordgo was designed to perform as an integral component between cord and digital device so it adjusts the cord automatically to "the perfect length."
It eliminates the tangling and physical interference of a cord and can be clipped to your belt, arm band, key chain, car visor, bag or slipped it in your pocket.
MSRP: $9.95 (and now with a "buy one, get one free" offer, plus free decals that can be affixed to the face of the cover)