Kopin's a company known for diminutive displays destined for duty as electronic view finders in camcorders and digicams. At E3 this year, the company's subsidiary Forth Dimensions Displays has unveiled a new use for its teeny tiny screens -- virtual reality. Called Replicating Reality, it uses two .8-inch 1280 x 1024 LCD panels and head tracking to place you in a 3D virtual world. We got to t