As I mentioned in a previous post, I have reworked the USA map project to represent the map in the game of Risk.
The above image shows how the XAML is defined. The XAML is based on the SVG file found here. Once the project is ran, each country (both its inner and outer polygons) are entered into a data graph, similar to the one I used for the USA Map, with just a few improvements.
This demo, when ran, assigns each country to a player and assumes that you are the Green player. If you click on a country that is bordered with bright green, its border will turn black and all enemy held countries' borders will turn white. This shows what nations are available to attack.
If a programmer had a risk game play engine, this silverlight front-end will work quite well for you. The complete project can be downloaded here.