In May, Microsoft introduced Project Hilo; Now they've released "Hilo Annotator application that provides basic image editing capabilities but more importantly it illustrates how to take advantage of following Windows functionalities:
Ribbon: To provide a modern, easy to use and easy to learn user interface.
Windows Imaging Component (WIC): To display and manipulate images.
Even more of technologies like Windows Animation Manager and Direct2D.
Download: Hilo Annotator app