[ale] wiki suggestions

[yahoo at jimpop.com (Jim Popovitch)]

I'm looking for some wiki like system that forces page editors to sign
in before editing a page.  I know this is against the wiki concept, so
perhaps I should say that I am looking for a CMS... one with wiki like
syntax ;-)

Additional interests include scalability (multiple servers, centralized
db storage) and security.  PHP5 applications are welcome... no PHP4 ones
however.... my preference would be Python however.

Thanks!

-Jim P.