kierandill
iPF Noob
Virtually all tablets, notebooks, desktop monitors, and smartphones have gone to at least a 16:9 ratio, including Apple's own iPhone. Some might argue that a printed page is more square and thus a 4:3 in portrait mode makes sense, but I suspect most reading on an iPad is of web content, which can generally take any shape you want. 4:3 in portrait mode seems to assume an image akin to an 8-1/2x11 sheet of paper.