Developments like this just make my day. The implementation is extremely small at the current stage but with exposure like this to a large audience it really opens a ton of doors. I'm all for getting younger people into programming and a nontrivial exercise such as this really allows someone to get a kid interested and have them run with it and get into some interesting territory. Javascript may not be the best language on the universe, but with the ability for application with things such as this for Mindstorms and Arduino really can open the doors for a whole new generation of hackers-to-be. Can't wait to toy with this stuff with my nephew when I travel home for Christmas.