Fabien Sanglard’s DIY head-tracking sunglasses [updated]

Although the Oculus Rift developer kits won't ship until next month, you can buy the Hillcrest FSRK-USB-2 motion tracking kit that the Rift will use for $100 today.
Update: According to RoadToVR.com, the Oculus Rift will now be using “the Adjacent Reality tracker, developed by a former Apple software engineer, which has much enhanced capabilities.”
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