I particularly like this latest Bing Maps platform integration because it comes from my home state of Florida. The state has used Bing Maps to display the information being gathered by the national census going on now. The link, available here: http://www.myfloridacensus.gov/FloridaHouseCensusValidator.aspx, shows a Silverlight Bing Maps application where you can see the various counties, districts, census tracts and blocks as well as where the census has been received and missed.
For more information on how to use the Map, head over to the instructions page here.
(via Bing Team blog)