Organic Groups: Enable users to create collaborative groups

Code is here: http://cvs.drupal.org/viewcvs/drupal/contributions/modules/og/

This module is growing very quickly and is in hot demand. Please help by indentifying the benefits of OG to users as well as the tasks this module allows to be accomplished.

Moshe, Gerhard, Robin, Trae, Charlie please take a moment to offer some insight.

Cheers,
Kieran