Just my two cents about wikis..
I run a number of wikis at work and I've learned something VERY important:
Never have more than 2 members with editing permissions (one main, and one standby if the main one gets hit by a truck).
If you allow more, you end up with a lot of replicated information, mistakes, omissions, people repeatedly editing other people's stuff, etc.
On most of the wikis I manage, there is a form that contributing members must fill out to request changes. All changes are reviewed and approved by a group or committee (size varies, depending on size of wiki). These groups are made up of people with the most experience/knowledge with the wiki subject(s). This ensures that all changes are moderated and retains the integrity of the wiki's information.
The thing that makes Saga's charts so reliable is that only she and one other have the power to edit the content, and she has very high standards when it comes to the accuracy of the information added.