We already have quite a few nice tags for classifying questions to make them better searchable.
But not all of them have a tag wiki, and some existing tag wikis are not really good. There is still some work to be done and 2 reputation to be earned for users who have not yet gained the privilege to approve tag wiki suggestions.
What format do we want the tag wikis to be in? Which information should be displayed when hovering over the tag or selecting a tag on creating a question?