Reading through the previous posts I found the following ideas:
The MS XBOX Live headset is good enough/worth the money, so this isn't worth doing.
The headset is USB so even if you did another USB headset wouldn't work as there would be no drivers for it on the XBOX.
Assuming you could get the MS XBOX Live headset connector (the "usb" device that plugs into the controller) you could wire up pretty much any headset as it uses a standard mini jack like on a cell phone.
Not sure what else you were looking for?
