This plugin by Jobjörn Folkesson adds an admin page with some bar graphs with basic statistics from your BuddyPress installation.
More specifically, it fetches data from the following tables:
wp_users
wp_bp_groups
wp_bp_activity_user_activity
wp_bp_xprofile_fields
wp_bp_xprofile_data
wp_bp_friends
wp_bp_groups_members
to generate the following bar graphs:
(all “multiselectbox”, “selectbox”, “checkbox” and “radio” fields have one bar graph each) (Xprofile)
Most friends (Friends)
Most group members (Groups)
Most actions (Activity)
Most popular component_action (Activity)
Download and info: http://wordpress.org/extend/plugins/buddypress-stats/