Since my last post on the topic of adding polygon data to your VirtualEarth map, VE has released not one, but two versions of the API. Starting with version 5 you are now able to add a layer containing polygon and line features to your map via a GeoRSS feed. Pretty cool.
Now the hard part becomes getting your GIS data in GeoRSS format, and that is where the GeoFeeder from BrightiSolutions comes in. It’s a desktop application that reads many types of GIS data (including ESRI Shapefile) and outputs the features in a GeoRSS file format. Check out the demo to see how you can customize the output.
Unfortunately it’s not free, but it could well be worth the $95 license if you don’t have the time to write your own code to converting your GIS data to a GeoRSS file.