Reader Ran Mokady at Hack-a-Day submitted his How-To for a DIY Xbox ... power supply cable; splicing the two cables together; rigging the ATX PSU to start up; and lastly, plugging it into the 360.

That means you'll only need one cord to set up a new Xbox + Kinect system, while Xbox 360 original owners will have to connect over USB and plug in a separate power cord for the Kinect unit.