this is wiki zoozoo
http://en.wikipedia.org/wiki/Aces_High_(video_game)
That's not "wiki", that's Wikipedia. (By the way, that article is going to be deleted some time unless we can come up with links to a few articles about Aces High from third party sites - e.g. reviews from big gaming sites, etc.) Wikipedia is an encyclopedia that runs on wiki software - just one example of a wiki.
A wiki is a collection of pages that are editable (often editable by anyone, or anyone that registers). The system stores the full editing history of each page (so it's easy to revert to an earlier version after a page is vandalised). Being very easy to edit makes it easy to keep up to date, and easy to add new pages about anything.
Wikis are a great way to store community knowledge and keep it up to date. An AH wiki is going to be a real plus.