BuddyPress.org

It would be extremely useful to admins of communities to keep track of basic activity within the community. Things like how many members sign up or join, how many posts, comments, threads are made, how many members are inactive for past n days, how many have filled out profile, etc.

This is functionality equivalent to maintaining a finger on the pulse of the community and tracking important variables to set goals, find out troublesome issues, measure growth, etc.