> Are there other
> common circumstances (video output?) where having square pixels by default
> would be problem?


I recently rendered a 720x480 series of images to be edited with video that
had an aspect ratio of 4:3. In addition, occasionally I renderer images
intended to be used as textures for my OpenGL programs; textures must have a
2^n x 2^m resolution, so non-square pixel aspect ratios are necessary if I
plan on drawing the texture at a different size in my program.

 - Slime
 [ http://www.slimeland.com/ ]

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