I’ve made a Mouse Guard oriented dice roller at http://mice.ensmartle.me/games.
You can collect together the missions for your games with a shared URL for your skype game. It checks for updates every ten seconds. There’s a slight hiccup with the updating when multiple people explode rolls at the same time.
It will also work for Burning Wheel and Empires, but there might not be enough dice for some rolls.
When I get a chance I’ll be adding in lightweight scripting support for Mouse Guard as well.
Any bugs, or suggestions, let me know.