My fellow wiki enthusiast, Andrew Mitchell from Urbis just sent me a link to a short and well written case study of wiki usage at a Sydney based company, Jenssen-Cilag. The CIO, Nathan Wallace, talks about how they used a wiki to rebuild their Intranet. You can see the case study on Nathan's blog

Replacing an existing Intranet with a wiki based solution can be a very successful way to introduce wiki technology into a corporation with a minimum of fuss. Nathan's experience is very similar to that of a number of companies that I have worked with and helps to show an Intranet upgrade is becoming one of the standard wiki adoption patterns.

Once a wiki is deployed widely in an organisation as the Intranet, then other benefits of using wikis in a work environment can be explored in a secure and sanctioned environment.