The Bing Maps team has announced a beta SDK for Bing Maps that is designed to give you a way to integrate Bing mapping into your Windows Metro style apps.
The SDK also comes with a native map control for use with any native or managed Metro style app written in C#, C++, and Visual Basic. According to the blog, the client vector rendering capability should offer smaller data downloads and improved rendering. The ‘road’ map style (which is limited to the US for this beta release) is rendered completely on the client. The control also offers a traffic overlay, and because it’s designed for use with XAML, you can also overlay and position any custom XAML element over the map.
In an attempt to encourage you all to go out and make use of Bing Maps, Microsoft is giving developers free and unlimited use of Bing Maps APIs until Windows 8 is released. You can download the beta from the Visual Studio Gallery.