Extend your GIS to Windows Phone 7 smartphones
The new ArcGIS API for the Microsoft Windows Phone 7 OS can now be used to create interactive apps that provide mapping resources including maps, device locators, and geoprocessing models. Using the Windows Phone technology and frameworks the application bar, controls, and location can all be effectively applied. The new API is available at no cost from the ArcGIS Resource Center and includes a detailed blog, forum, samples, and support.
ESRI has released a Geographic Information System (GIS) API for the new Microsoft Windows Phone 7 platform