Sony’s MWC booth features a number of prize winners from their recent multi screen competition. One of my favourites was a simple gestural method of connecting multiple screens called Pinch. You just pinch the screens together, which draws a straight line between them both. This allows content to flow between screens as if they are attached.
Interesting applications in multi-screen interactions like gaming, but it is limited in that the devices must be right beside each other for it to work.