At the Intel Booth, I can me across a truly fascinating interactive display for the next-gen interactive and what they're calling 'Intelligent” digital signage.
It featured a background of a department store with a glass enclosure placed about 3 feet away. Through sensors, users were able to use the glass as a touch-sensitive surface to select items on sale, or display. Options like these have been implemented in future cities like Tokyo.
I suppose it'll be quite a while before we see this technology in our neck of the woods, but you never know.