My teammate Jared Bienz informed me the other day about a CodePlex project he just helped finish called VIEWS, which is a really cool Virtual Earth Wrapper for Silverlight.  It's released as a a managed layer for integrating mapping in your Silverlight apps and is easy to use. If, like me, you've been looking for an easy way to integrate maps into your Silverlight applications - this could be exactly what you need.  Check out Jared's video on Channel 9 as well as his blog and the official CodePlex site for more information.