Well, it's not quite the 3D holographic display I'd like ... but the Virtual Laser Keyboard is pretty close:
The Virtual Keyboard uses light to project a full-sized computer keyboard onto almost any surface. Used with Smart Phones and PDA's, the VKB provides a practical way to do email, word processing and spreadsheet tasks, allowing the user to leave the laptop computer at home. VKB observes the user's finger movements to interpret and record keystrokes. Since the virtual keyboard is an image projected in light, it completely disappears when not in use.
Sounds kinda handy, and the $200 price tag isn't too unreasonably for device which will outgeek nearly every other keyboard on the block. ( thanks OhGizmo! )
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That optimus keyboard was pretty awesome, but this totally blows it out of the geek waters.
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