Searched words:
menu trails indicating active states
active menu trail right now-- like the main Projects link still being depressed when on an actual project page
There is a hefty patch porting the MenuTrails module to Drupal 7, but it is reported to not work (read: cause fatal errors with) Organic Groups.
See also: http://data.agaric.com/breadcrumb-control
The solution: Faking an active trail for items not in a menu: Drupal 7 active state for main menu based on content type
