If these things became cheap enough that everyone had one, each player could have a networked interface that had the game table in one panel/tab, the rules in another and their stats in a third. It'd almost be like an MMO UI, but operated manually.

Additionally, everyone could have a different view—the DM could be looking down a corridor that is "fog of war"-ed for the PCs. On the other hand, if everyone had a unified interface, all the iPads could be layed out together on the table to make one big surface, where scrolling one scrolled the others as well.