I'm really happy for being showcased in the official Telerik's Windows 8 apps gallery, together with other 9 apps.
My app "The Wedding Planner" leverages the great RadControls for Windows 8 from Telerik since their early beta versions. In details, I adopted the XAML DatePicker, which enables users to input dates through a looping-list picker, similarly to Windows Phone one.
If you are building Windows 8 apps, try Telerik's RadControls for Windows 8, they're are currently available at a special launch price! And don't forget the other great Telerik's tools, like JustCode, JustMock and JustTrace. Really helpful in everyday developer's life.