For wiki-style collaboration I usually use either PBWiki (or pbworks,
whatever, it's all the sme company) or
sites.google.com
Both allow for FREE, private, multi-user, instant, online collaboration
using a free online smart editing engine. Same as Wikipedia.
And the results of that collaboration on both, are mark-up pages that are
viewable privately if you wish, or publicly if you wish.
Will Johnson