Well, it looks like those keen to attempt their own real life trek across Azeroth
(or the virtual world of their choice) now have a fairly straightforward course of action to follow, as the originators of the MMO-connected treadmill have just posted some detailed plans for the rig on the ever-useful Instructables website. In case you didn't catch it the first time around, the setup simply uses a mouse (they recommend an MX Revolution) that's held in place against a mousepad affixed to a bicycle wheel, which itself is simply rested against the treadmill -- a joystick handles the directional control. Of course, there's nothing stopping you from taking things a few steps further and, if you do, be sure to let us know.
[Via Hack a Day