[Zacker]

A wiki is a good media if its controlled to some extend. I believe that you coudl easily have more strict requirements for editing without killing the great wiki spirit.

First of all only registred users should be allowed to edit pages. If you dont care to register, then your submissions probably aren't going to be worth anything.

The admins(=the council) should be able to set some kind of flag for the important and already big pages. This flag should allow only certified people to edit them.

Thoose fairly simple rules would give the best value of a wiki imho.