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by ConstantineXVI 5309 days ago
The concept itself isn't very far removed from pie menus[1]; which have been around for quite some time. They're much more common in console games these days (the layout maps very well to an analog stick or face buttons); SketchBook (on both the desktop and phones/tablets) is another recent example that comes to mind.

[1] http://en.wikipedia.org/wiki/Pie_menu