Shayne, We use these (http://www.vuzix.com/iwear/products_vr920.html) experimentally, because they are cheap, and slightly surprisingly support quad buffer stereo, which means they more or less work with OSG (on Nvidia Quadro's, at least) straight out of the box.
Unfortunately, most of our in-house OSG apps hijack the camera in one way or another and assume that they are not being run stereo, so all goes a bit awry. Work in progress... David
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