Is it possible to achieve a grayscale look for the Bing basemap in ArcMap 10? I noticed that its possible with the maps hosted by ESRI since we can access the server that is hosting them. I haven't been able to find anything on Bing. Even using the OpenStreet Maps would be a great alternative, but again there doesn't seem to be an open server to use the trick posted on ESRI's mapping blog.
Edit
It looks like this is currently not possible, so I'm accepting the "its not possible answer". If this does become possible in the future please submit an answer!
Best Answer
Grey-Scaling can only be done when the data is a 'Mosaic Dataset' (in a geodatabase)
This can be done: http://mappingcenter.esri.com/index.cfm?fa=ask.answers&q=2163
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00s500000017000000.htm
The only other method is to Dim the BaseMaps