Those who have seen the Microsoft Surface, or the Minority Report, will understand this technology: Microsoft Touchwall, dubbed as "Intelligent Whiteboard". What's that, you asked? Basically, having Surface multi-touch and movement recognition capability on any flat surface (or so it seems from the video). Bill Gates was showing the Touchwall during the CEO Summit 2008, using whiteboard. Yeah, plain 'ol whiteboard. Imagine touching, poking, dragging your fingers on the whiteboard, while the images on the whiteboard is being moved/scaled/resized/played accordingly.
However, there was one big question here: if the "Intelligent Whiteboard" is supposed to be shown to audiences such as those powerpoint slides on projector, will it work when the presenter (in this case, Bill Gates) keep on blocking audience view??? *scratch head*