Like many people I have a mess of extra cables — displays, ethernet, usb, sound/speaker of many flavors, firewire, etc etc etc. I used to just keep them in a tangled mess in a drawer.
But I had an unused shoe rack like this one — Chrome Over-the-Door Shoe Rack — it is pretty great for storing cables. Lots of ways to hook them over the shoe holders, easy to keep them organized by type, etc.