TouchLight
Siggraph 2005 Emerging Technologies
A unique transparent display using computer vision technology, ToughLight enables new applications in gesture-based UI, video conferencing, augmented reality & ubiquitous computing.
Emerging Technologies web site TouchLight entry
an early paper details configuration, image processing, etc.
video (wmv) demonstrating a somewhat later version of TouchLight
video taken for MSDN's Channel 9
Andy Wilson's Microsoft Research home page