This sounds great at first but I'm unclear about how usable it would actually be. Any pressure on the device would cause the screen to jump about.

I could see it being ok in start-then-put-down mode for Movies and Slideshows. But how often do we use phones like that? I look at photos in tiny batches normally with one other person, usually in a crowded place: pub, restaurant, car. I rarely watch movies on my iPhone but when I do it is usually on a train or in a car.

The need for a static white wall and a conveniently tall table in an uncrowded space makes me question the utility of this at all.