Nokia N9 UX Guidelines (developer.nokia.com)
I find it very interesting how thoroughly they have mapped out the 3d physical reality behind the interface interactions, all the way down to the specified light source that should be reflected in all icons and 3d chrome. In many ways this is more thoughtful than the iOS interface guidelines.
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[ 4.1 ms ] story [ 14.9 ms ] threadI also like/am curious about the color guidelines, namely that each application should "own" a single highlight color, which then gets used consistently in its headers, labels, and form controls. The applications demoed in the docs have a much more consistent and less kitschy look than many brightly-colored, inconsistent iPhone apps.