I have always enjoyed taking apart electronics to salvage components and see what makes em tick, and this is a little mod that let me dig into the guts of a relatively straight-forward device: an XBox controller. I have a bunch of old controllers around, along with some Arduino Nano boards, so decided to join another together with an RF module in order to control various devices wirelessly. The controller basically consists of a bunch of potentiometers and buttons arranged in an easy-to-operate kind of way, so this build is fairly simple in theory. As such, the wiring is fairly straight forward, there are just a lot of wires to connect to make use all of the inputs. I chose an APC220 radio module due to its ease of use (UART/TTL), range (1Km), and the fact that it allows communication with computers and Arduino based devices. The settings (frequency, data rate, etc) can also be changed on the fly, so it is fairly versatile. Any Arduino compatible RF module could be used in its place. I believe this would work similarly with a 360 controller, but haven't taken one apart... yet.
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Details and pictures at TMRh20s Project Blog