I just downloaded and played around with the new Silverlight control for Bing Maps. It just took me a few minutes to download, install and create a simple map application:
All information on how to get started here:
http://www.bing.com/community/blogs/maps/archive/2009/11/09/bing-maps-silverlight-control-1-0-released.aspx
And check out the interactive SDK here:
http://www.microsoft.com/maps/isdk/silverlight/
56a42b2e-1cd3-4de7-96a9-77944999ce92|0|.0