Here's a prototype screen interface from Microsoft which was demoed at the CEBIT 2006 conference. It's very similar to the interface from the movie Minority Report. I believe they are using a rear projector (though it's possible they are using an LCD). Basically there is a piece of glass with the display on it and then behind the glass is a motion sensor which tracks the user movements (I believe). There is either an LCD sandwiched in between two pieces of glass or a rear projector. I also think this is the interface that Robert Scoble talks about in this interview.
Here's a prototype screen interface from Microsoft which was demoed at the CEBIT 2006 conference. It's very similar to the interface from the movie Minority Report. I believe they are using a rear projector (though it's possible they are using an LCD). Basically there is a piece of glass with the display on it and then behind the glass is a motion sensor which tracks the user movements (I believe). There is either an LCD sandwiched in between two pieces of glass or a rear projector. I also think this is the interface that Robert Scoble talks about in this 
