Forum member Cerberus posted a tutorial on how to rig up an always-on USB charging port for your PC using a spare USB port, a resistor, and a few pieces of wire.
It requires a small bit of soldering know-how, but anyone who has used an iron at least one time can pull this off. It is a great option for someone looking to reduce clutter while saving energy, since it enables and USB device to charge while your PC is turned off without the need for yet another wall wart.
