The Market shows it compatible with my old HTC Inspire (aka Dream HD), but not with my GN or with the Nook Color I used to have. So it might be a screen size issue. The Inspire is 4.3", 800x480; the Nook is 7", 1024x600; the GN is 4.6", 1280x720.
Apps have to specify what screen sizes they work with, and can't specify screen sizes that didn't exist in the SDK version they were built for, so the upward creep in phone sizes does tend to leave older apps behind. It's not necessarily hard to update them, but it's not always automatic.
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Apps have to specify what screen sizes they work with, and can't specify screen sizes that didn't exist in the SDK version they were built for, so the upward creep in phone sizes does tend to leave older apps behind. It's not necessarily hard to update them, but it's not always automatic.