Nikon has announced a pair of headphones that combine a display, headphones, mobile A/V player, Wi-Fi capability, high-capacity memory, and a power source into a single device. The UP300x and UP300 allow users to have a viewing experience “equivalent to that of viewing a 50-inch large screen from a distance of three meters.” The UP300x has 8GB of internal memory and a built-in motion sensor for hands free operation, meaning you can adjust things like the volume on the headset by simply moving your head from one side to the other. This is a monster announcement by Nikon, as this is one big step toward a truly immersive, mobile, hands-free multimedia environment.  [Nikon]