ArcGIS Extension for the Google Maps API
This extension for the Google Maps API allows you to integrate your maps with the Google Maps base layers. You can perform query and geoprocessing tasks on your services and work with the results as features. You can also publish your content as a Google Mapplet.
To get started, see the ArcGIS Extension for the Google Maps API home page.
ArcGIS Extension for Bing Maps
This extension for Bing Maps allows you to display your maps over the Bing Maps basemaps in 2D or 3D. You can perform query and geoprocessing tasks on your services and work with the results as VEShapes. You can also perform geocoding operations and view the results on the basemap.
To get started, see the ArcGIS Extension for Bing Maps home page.