For those looking for a device strictly for reading, the new Kobo is a nice little option. It's small enough to slip into a pocket, can do more with a PDF than the competition, and at $129, it's $10 cheaper than both the Nook and Kindle WiFi.
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algorithms need to be optimized to go BEYOND face tracking - how about T zone eye tracking?
the math required is horrendous for a video feed, and grabbing some headgear for a FPS game would slightly lend itself to the immersion experience.
remove headgear to save and exit game.