There's been some more movement of late in the Augmented Reality/Heads Up Display space.
Vuzix have partnered with AR company MetaIO to market an addon for their VR920 video glasses (the older, Star Trek style, non-transparent ones). The package features a USB camera that clips onto the front middle of the gogs, and a 3-axis accelerometer pointer/wand thingy for poking stuff in AR space. The camera assembly also packs some capacity to sense the users position and orientation - no mention of precisely how it does this, though given that they're prepping another addon for the as-yet unreleased (transparent) Wrap 920AV model that features accelerometers for head-tracking, I assume they're using the same hardware on the VR920 AR upgrade.
Carl-Zeiss have come to the party with a shiny looking pair of video glasses - the 'Cinemizer'. Technology wise, these basically look to be on-par with the un-upgraded Vuzix VR920's. They're non-transparent with extendable earphone arms and feature a screen similar to a 45" tv at 78" distance. Whatever that means in terms of resolution, they're not saying, though apparently it's really really good. They're going to be available in May for US$499. Though for that price you're probably better off waiting for a few months for Vuzix's Wrap 920AV's - they look better, they're transparent so you won't walk into walls and they can actually do Augmented Reality.
In other news, I found a grinder/hacker/whatever. b.zerk is making his own sensor gloves to go with his Vuzix VR920 + Webcam that he hacked up to run with his OS X laptop. Some cool photos on flickr: