http://www.xmind.net/download/win/Before we go anywhere with actually writing a script the best way to get started is through brainstorming. The problem is that we all live around the world on the internet and our collective thoughts are much more difficult to convey in text form than it would be for everyone to sit in a room and blurt stuff out as it comes to mind.
Because of this, perhaps it would be best if we started with mapping out our collective thoughts and let the best ideas float to the top. We can literally turn the gobs of ideas into a picture and upload it.