Keep a close watch on Stewart Maders 21 days of Wiki Adoption. This set of 21 short videos will help you to understand the concept of Wiki use in your organisation.
Stewart is the author of 2 books, Wikipatterns and Using Wiki in Education. I have followed his blog on wiki patterns for some time now, and he is great at explaining the wiki concept in "plain english" just like the guys at CommonCraft.
The key thing about this series of videos is the simplicity and clarity of the examples that Stewart delivers. I frequently get asked in my organisation - "What is a wiki?" (this normally comes about 15 mins into my demo of our enterprise wiki!).
But that is ok for me, as if it takes them 15 mins to query the technology, then maybe the underlying benefits of collaboration, knowledge sharing and intuitive information retrieval are more prominent. The best bit is when we get to the cost!
So follow Stewart's videos and learn! As Luis Suarez said:
I bet, I know, I am sure of it, that after watching through the entire show with the different episodes, you would be more than ready to start deploying those wikis within your organisation.