I do not know really know what to think of this yet.
But it got me thinking of uses in game for it.
Maybe Mario128 is actually for this device (remember rumors of it NOT being on GC?)
And remeber the rumors of it being a 2D/3D hybrid? 1 screen 2D, the other 3D at the same time?
Or what about Zelda games that you see in first person (this would be alot like metroid prime), and the other screen is either OOT style, or overhead Link to the past style.
Or Zelda wind waker style literally warps to the other screen into another "world" and actually is able to turned into realistic graphics/settings.
Or smash bros. game that when you SMASH the players gets belted onto the other other screen for additonal power ups, or additional fighting, or whatever.
Think of the 2nd screen as another world, another goal, another view, another room, another menu, another player (?), or how about a FPS with your perspective on 1 screen, the enemies on the other? or a racing game with similar concepts?
Or racing with a view from the drivers seat, and one overhead, or 1 view of outside shot, 1 of the gauges?
But I think Nintendo would have developed more uses than dual screens, OTHER than alternate views.
maybe onscreen characters controlled by 1 at the same time (think Pikmin 2)?
And imagine carrying this thing around "is that a THIRD PILLAR in your pocket, or are you just happy to see me?"