I did this in the karma war, it was like playing chess.. very complex. I'm hoping this war eclipses Karma because it will make doing this really entertaining.
This is done with Paint. Not any fancy - Boring program that will make it look neater or better, or whatever. Just my mouse and the basic program for Windows. I base the graph on declarations made. I don't add arrows if 3 nations from A hitting C because C is defending B.
This was the latest (but not the last one I did) of the Karma war if your interested in how big that one got: http://img402.imageshack.us/img402/6333/warmappng1h.png
Any incorrect information.. feel free to let me know.