On the subject of groupware, and the efficacy of Mediawiki, I found this.
http://meta.wikimedia.org/wiki/Help:Introduction
****
What else can MediaWiki do?
While MediaWiki is not designed to do these things, it can be used as...
...Content Management System (CMS) software
...Forum or Bulletin Board System (BBS) software
...Groupware, Messaging, or Computer Supported Cooperative Work (CSCW) software
...a Workflow Management System (WfMS).
See m:Wiki Uses for further description and discussion of these items.
****
I also recall Brion saying that Mediawiki was not adequate for the
requirements of Commons, but I am sure he will be able to speak for
himself and correct me if I am wrong.
Also, if Mediawiki can do everything, why do we need a Mailman mailing list?
--
Gordo (aka LoopZilla)
gordon.joly(a)pobox.com
http://pobox.com/~gordo/
http://www.loopzilla.org/