I'm in the design stage of an iphone minigames collection, and I haven't made a firm decision on the device orientation yet. Some of the ideas would seem to work better vertically, others horizontally. All else being equal, is there an objectively better orientation for games? I'm wondering if there has been any user testing or even polls that might indicate which is preferred. My personal take is that vertical is less 'fiddly' as it would be the natural position for the device to rest in your hand (and the placement of buttons and jacks is also oriented to this position), but it could also be that gamers are more comfortable with a horizontal position (mimicking a familiar gamepad orientation). Thoughts?