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Barrett welcomed a "bright star of innovation" to the stage, Dr. Johnny Chung Lee, and expert in computer-human interfaces. Lee demonstrated a low-cost ($50) electronic white board using existing technology. With a Wii remote, a PC, a projector, and an IR pen, Lee demonstrated his concept projected onto a piece of white foam core (any flat white surface should suffice). The software is available for download for free from Lee's Website
This is brilliant. I know some teachers who can make use of this.