How about this...
http://www.wikiweb.com/ A company that is trying to
*sell* wikis to business.
Their free wiki hosting shut down, though:
http://worldcrossing.com/WebX?128@109.vOD6blmYphc^0@.eeb73e8
(there's a link to Wikipedia there)
And why should you choose their wiki software, as opposed to, say,
Clifford's?
http://www.wikiweb.com/intro7.html
*chuckle*
Larry