Really cool technology. Companies and individuals are starting to take notice and experiment with AR. Augmented Reality takes a live view of the real world and merges them with computer-generated images to create a virtual and interactive reality.
Note quite the 3D simulated world envisioned in yesteryear, but it is still very interesting.
Interestingly the Lockheed Martin F-35 Lightning II, a fifth-generation, single-seat, single-engine, stealth multirole fighter, that can perform close air support, tactical bombing, and air defense missions doesn't use a traditional HUD, but instead tracks targets through the pilot's helmet mounted display (HMD) that uses an Augmented Reality System that even allows the pilot to look through his own aircraft as if it weren't there.