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]