SICKmods' ATX to Xbox PSU Converter v1.0!!

http://sickmods.net/index.php?site=PSU-Converter

This device will allow you to use ATX Power Supplies to power up your Xbox version 1.0-1.5. This is a great feature for casemodders who have their Xbox  in a different case, such as a PC case. You'll be able to power it up using the
Xbox's power button like normal.

You can also buy the ATX headers for the board so you can plug the PSX supply into the board, then plug the board into the Xbox Motherboard!  NICE ADAPTER!  This saves you from soldering wires or making your own.