"Xbox Joybox" - Use PSX Controllers - SiliconIce @ 22:29 CST
Here's the site's description:
Xbox Joybox
-High quality 3rd party product.
-Convert the PSX/PSX2 controller to be used on the XBOX console.
-Comes with dual slots for memory cards and other peripherals
-This is not an official XBOX or Microsoft product.
Of course, I have not tested the product and make no guarantees as to its functionality.
Source
http://www.xboxhacker.net 
