Charles Petzold blogged about a rather interesting, while geeky, topic a bit ago about non-affine transforms. I personally had to look up what that exactly meant, but what it allowed Charles to create create curved slider bars with WPF.
Charles has a 2D shown to your right, my left, XAML example along with a 3D transform too.
His blog post goes on to explain the needed settings and issues on doing this.
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