http://virtualearthwpf.codeplex.com/

This control comes in two versions: one for regular WPF applications and one with Microsoft Surface enhancements (multitouch pan and zoom gestures).

Previous implementation of Virtual Earth on Surface were done using transparent windows and the map itself had limitations (no rotation or transforms, etc.) due to Win32 interop.
InfoStrat.VE uses some magic to eliminate these restrictions. It also takes advantage of WPF data binding for controlling various properties such as the camera location. You can add pushpins by simply adding a WPF-based VEPushPin as a child element. VEPushPins can also be provided by a data-bound collection.

Obviously this is a wpf control but via wpf you can run it on a surface..

I can see some fun times ahead wait till you see what Virtual Earth has in store for you at mix!