Dusan Writer suggests that the wiki adoption patterns and strategies on Wikipatterns.com can also be applied to virtual worlds:

Wiki Patterns for example, offers a toolkit for companies and communities looking to optimize the use of Wikis. But this toolkit sounds suitable as a “best practices toolkit” for Second Life.

This is a nice little site with lots of nuggets for community and collaborative managers using virtual world platforms, which in some ways are massive, organic, and powerful Wikis themselves (just in 3D!)