Jean-Christian Imbeault:
Rene Pijlman:
Have you looked at MoinMoin? http://moinmoin.wikiwikiweb.de/
It supports ACL's and AFAIK it's a very reasonable wiki engine.
Looks very good! Will give it a try!
By the way, here's another list of options: http://c2.com/cgi/wiki?WikiChoicetree (see branch "User permissions").
pmWiki may be of interest. http://www.pmwiki.org/
I've been playing with moinmoin, and I find the wiki syntax rather limited, especially the free link syntax. This in a Wikipedia:
[[Two words|with this text]]
cannot be done in moinmoin.