Was so impressed and inspired by what I saw on your link, that I talked our production team into using a google site. We have it live and r using it for our production of Metaphasia. If you are interested in checking it out it is at. It works out well because we can each edit it independently. As long as we respect each others space and edits it works out so well. Increasing communications between the production, directing team and the actors is what we see as the strength of this tool.
https://sites.google.com/site/smsspringmusical2011/