Head-worn displays still being worked on ...
During the Tech Boom there were numerous companies and people working on Head-Mounted displays. As a dealer for Xybernaut, one of the only dedicated wearable computer vendors at the time, I bought a nice unit from Olympus. It was one of a very small lot of units, and was built to integrate into the Xybernaut units. I used it for a lot of my WarBlading efforts ... our "war driving" on roller blades. :-)
Shimadzu is one of the vendors who has persisted in this space ... they have always had an impressive (yet costly) solution. Their Data Glass 2/A has some impressive specs, and I can't wait to see exactly what the Data Glass 3 will be!
What got my started looking at this again was a post I read that lead me to some more current research. I came across this web page by Ozan Cakmakci who designed a new head-worn display, and wrote some papers about them. It's cool to see that people are still looking at this.