Oculus Rift is about as close as we've gotten so far to true virtual reality. It's a head-mounted device that creates an immersive VR experience. A user wearing the headset, for example, can turn his head and the application responds by moving the immersive environment.
Sounds pretty cool -- if it ever comes to fruition (we've been promised the device Real Soon Now for a few years). When immersive VR experiences like Oculus Rift do hit the consumer market, will they have an application in the court room?