When it comes to doing a code review or project review, nothing beats huddling around the projector! Even with multiple monitors you can't get more than a couple people crowding in to see the material. Since we have a big white board we can just wipe it clean and connect a projector up to one of the computers video lines. Instant big screen code review in the development area! There's still enough open whiteboard to jot notes or mark up what's being displayed. Now if I could just get the big dogs to spring for a smart board!
I think it'd be awesome to pair (or mob program) using a dual or triple projector set up on a wall!