Whatever technology you use for your wiki, make sure that you know who's in charge. Appoint curators for the whole wiki or just for particular parts. They can help by culling irrelevant material, and by guiding people to put their information in the right place.

This should also reduce the risk of conflicts developing between team members as they edit each other's work (known as "edit warring"). Curators can decide if and when posts appear, and whether certain discussions need to be held offline.