As per the discussion on this thread: http://www.rainbowportal.net/AspNetForums/ShowPost.aspx?PostID=3422
I set up a Rainbow Wiki at:
I'll start putting my graphics and themes documentation on here and that may give people a feel for its potential.
Note: The domain names "rainbowdocs" or "rainbowportaldocs" are currently available. If the Wiki seems to catch on, I can register one of those and point them at this site.
Let me know what you think.