Planar dual monitors-mirror combo
Planar 3D is making 3D displays from mirrors and a pair of flat screens. They call the combo a StereoMirror™. The two LCD displays are oriented at a fixed angle and a passive beam splitter mirror bisects the angle formed between the two monitors mounted on the stand. The mirror is 50% reflective and 50% transparent so you can see both images superposed. Polarizers and passive glasses separate the two images so each eye receives only one of them.