This is the process part of people, process and technology.  It's not enough to simply build a wiki and send out URLs.  It's not enough to book a band and a ball room... you actually have to send out an invitation list, to market it a bit, to get some early adopters, to get the word out, to use it for a purpose, to design it with some meaning, to fill a niche.

It's very important to consider things ''other'' than the technology when making a wiki available... that is if you want it to be adopted.

see also:
* http://www.possibility.com/epowiki/Wiki.jsp?page=GettingYourWikiAdopted
* http://irish.typepad.com/classroom/2004/10/wiki_best_pract.html