BuddyPress.org

a little quick tip i did to display the latest activity for a group
http://etivite.com/groups/buddypress/forum/topic/quick-tip-display-the-groups-recent-activity-on-group-directory-groups-loop/#topic

but this is using the activity stream content – so to filter the activity content to just forum topics: change the line ‘action’ => false to ‘action’ => ‘new_forum_topic’ you may need to tweak some other stuff (content, title, etc)

see how it works here:
http://etivite.com/groups/