Europear researchers have developed the first fully functional treadmill that can go in any direction:

Very awesome idea can have applications in areas like architecture, therapy, trainning – but most exciting of all: virtual reality and gaming!
Imagine playing, for instance, a virtual reality FPS were you can actually run and walk around?
A future were MMO players would be all healthy, and the best players would probably be athletes? xD

Source: TechEBlog