Wearable Displays?

tolan's my name asks: "I am currently looking at designing and building my own wearable. I'm looking at using some sort of ARM processor, some basic voice command recognition, and so on. The real bugbear at the moment is the display. What I'm really looking for is a single eye HUD, so as I can actually wear the thing and function normally (as normally as one can while looking like a Borg). I was wondering if anybody on /. knew of sources for this sort of display and if anyone had any experience of using them. More generally any experiences or links concerning wearables in general would be appreciated, though not ones using the PC/104 hardware platform."