This double-sided screen is still in the conceptual stage, but I could imagine it becoming a "must-have" for gamers, etc., that's if they could afford it of course
Well, I recently saw another concept which was said to be definitely on the way. It consisted of what looked like three pens standing on their ends. One projected an image onto the wall and this, of course, was your screen/monitor. Another projected an image of a keyboard onto your desk and this could be used as an actual keybord. Another projected a circular patch of light onto the desk and this was some sort of virtual mouse.