A few days ago, when I was talking about possibilities using a tablet computer at work with a friend, a piece of information, almost two years old came back to my memory.
Arena.net promised some sort of "out of in-game" experience using tablets or smart phones. Images appeared, likes this
The pictures hinted some sort of chat/message system and a way to observe the whereabouts of your friends on the world map.
Since then, no news about this topic was heard again. Is the project still running, was it cancelled?