Microvision has been touting those projectors for at least most of a decade now. They're so incredibly awesome, if they work and don't have major drawbacks, that I conclude they don't really work. :(
They've shown actual products working, most notably at e.g. CES. Wonder why they haven't brought them to market yet? I'm thinking they're still rather expensive to produce.
If they don't fail in some obvious way (low battery life; heavy or wearing on the ears and nose; risk of damage to the eye; can't produce true color; or something), I'd happily pay thousands of dollars for one, and I can imagine many, many other people would as well, which would help them drive costs down.
At first I thought they were holding out for a large contract from the DoD or something, but after this long I just assume there's something critically wrong with them (one of the above), or that the managers are idiots who can fail to profit from having warehouses of gold. :)
