Samsung has developed a completely transparent solar-powered monitor that's designed to be used with ambient light. Though they're marketing it as a television, it's almost certainly going to be used initially as displays in commercial areas, and it apparently is also a touch-screen, opening it up for the coolest kind of kiosk you've ever used. See a video after the jump.
Toward the end of this video, the demonstrator switches to a mockup of venetian blinds, showing that this technology could be used as a regular window, and the LCD could be used for light blocking or privacy. Of course, windows with LCDs for that purpose have been around for a long time, but imagine having one of these on your office window.