The possibilties of an omni-directional treadmill seem limited when you first think about it. However, if you think about virtual worlds, you suddenly realize that such a thing could increase the realism of a virtual world, exercise, etc.
The Omni-Directional Treadmill (ODT) is a revolutionary device for locomotion in large-scale virtual environments. The device allows its user to walk or jog in any direction of travel.