ArcGIS users have seamless access to Bing Maps.
ArcGIS 10 for DesktopYou have access to Bing Maps directly from within the ArcMap basemap gallery at no cost for internal use.
ArcGIS 9.3.1 for DesktopYou must first register to access Bing Maps, and can then use Bing Maps at no cost for internal use.
ArcGIS ExplorerBing Maps are included in the ArcGIS Explorer basemap gallery and are free for all ArcGIS Explorer users.
ArcPad 10Access to Bing Maps is free for internal use.
ArcGIS 10 for ServerAccess to Bing Maps layers (roads, aerial, hybrid) is free for internal use with a limit of 2 million transactions per 4 cores, per year. You must contract directly with Microsoft to use Bing Maps in an external application or to use Bing Maps geocoding or routing.
ArcGIS Web MappingIf you are using the ArcGIS Web Mapping APIs but do not also have an ArcGIS for Server license, you must contract directly with Microsoft.