I don't know if this has been brought up before or not, but I think we need a good stats page. I know phpBB has a good mod for this, so the source is available for the basic structure. I know some of the info is already somewhat stored, but not collectively displayed.
Anyway what I was curious is things like a bar graph showing like what weeks/months you had the most new signups and/or when you had the most posts, etc. Then maybe keep track of the most used smileys. You could make it both user and admin viewable, or select one or ther other.
I know a lot of users like to see stats, so it might be cool. But other people might like to keep that information private. So they would have that option.
I would mainly use it for monitoring growth and board activity. See if more people sign up right after a big event, or if people post more or less during a time, etc.