I worked for a very large software corporation for a few years, and we had exactly this. Little touchscreen LCD displays to the side of the door for all the maj

I worked for a very large software corporation for a few years, and we had exactly this. Little touchscreen LCD displays to the side of the door for all the major meeting rooms, on which you could book the room. Nobody used it for that, though. They just did it from their desk through Outlook. It was useful to see how long a room was free for if you needed it for an impromptu meeting, however ("Next booking for this room is at 14:00 by Dave Smith (dsmith)" or whatever).