Hello..
Seems like you just cant find the tutorials to do this any more. I have mentioned it a few times but could never find a tutorial to link too.
so i decided to mod one of my extra controllers to demonstrate.
here we go then..
(items needed)
1. xbox controller
2. Usb port or usb male A to female A extention cable
3. solder and soldering iron.
4. Insuation tape, (i always use this stuff)
5. Some means to fix the port to controller. (i use double sided tape)
Ok so I did not have a extention cable. so i riped a famale port out of a old pc case.
I then got some usb cable so the colours are correct for those who are using a usb extention cable I removed the sheilding and and solderd the wires in place.



Next i dissasembled a cheap and nasty xbox controller. (I have done this to a official s type controller in the past its the same)
I then removed the plastic that the memory cards plug in to (only the front port 1) and left the prongs showing.


I then solderd the wires to the prongs.. Black. Skip a peg, Green white red.
(sorry about the blury picture)

I then insulated all the wires and prongs using insulation tape, because the memory card attachment on port 1 had now been removed i was able to push the usb adapter through the holder, (you may need to enlarge the hole) and re-assembled the controller

I finaly wraped double sided tape around the usb female adapter And pushed it back in to the memory card slot where it adheared to the plastic.
And finaly i put some insulation tape over the top and cut out a hold for the usb device's to be able to connect..
(i only had blue tape lol..

this is a really fast and easy mod for a controller. it allowsyou to connect usb devices to your xbox and the controller still works.
I use SD card readers and SD cards with it as a memory card, they seem to always work where thumb drives are hit and miss.
This is my fave way of transfering save exploits to a un-moded xbox.
usb extention cables can be found for less than £1 with free shipping on ebay. and most people have a sd card reader and sd cards these days thanx to digital cameras. Only teted on 256mb up to 1gb though.
hope this helps some one some where,
Its a really usefull mod. I can find a controller and cable on ebay for less than a 8mb xbox memory card. So this is definatly more cost effective,