The Oculus Rift is already great when you're just sitting down, but it's easy to imagine an awesome future where you walk around with it on. A holodeck on your face. Well, that future's already here.
Meet the Inversion VR system from Zero Latency. Unlike a holodeck, you can't just walk in though. To get in the game you have to don your Oculus Rift, strap on your computer backpack, pick up your fake gun, only after you've outfitted your entire play-space with a series of tracking cameras. But damned if the results don't look totally worth it. Motion-tracking already makes the Oculus Rift go from mind-blowing to totally-mind-blowing when you're just sitting down, and being able to walk around must up the ante that much more.