Organic groups is a module that enables you to create groups and subscribe members and content to groups. It was one of the most widely-used modules in both Drupal 5 and Drupal 6. The Drupal 7 version is a re-envisioning of groups to fit within the new "entity" paradigm.
The abstractions introduced in Organic groups 7 have thrown even those who are familiar with the module for a loop. I will go over some of the key concepts of Organic groups in Drupal 7 as well as some advanced concepts such as Views integration in this session.
We will not touch any code, but I hope that you will be able to follow along on your laptop and local Drupal environment with Organic groups and its dependencies installed.