Re: You forgot one important(sic) catagory
Re: @AC - "The aspect ratio is perfect for 35mm/DSLR pictures. Not everything is in HD Widescreen you know."
Actually, the perfect aspect ratio for camera's is 1:1 ie. square, because it is easier to produce high-quality circular optics and lenses than any other format. So to arrive at all other aspect ratios, the issue is how much of the image you are prepared to discard...