I have setup an Etherpad which allows as to edit things simultaneously.
It is supposed to be some sort of brainstorming list.
I have copied a lot from this thread here and the next step is to throw out all we don't need. The other parts we should work out finer.

Everyone can edit it. By clicking on the disk button a snapshot will be created. So if someone after you edits this list, it is not lost.

http://etherpad.com/rXhFZCN70j (requires cookies!)

If you don't want to use it, that's okay too. It's just a try because it's not easy to sort out all the things written in this thread.