What is a Drupal 7 distribution, how to find, install, and use them.
These are Drupal distributions (full-featured and others) with documentation that is kept on their own sites:
Installing and upgrading Drupal 7 distributions.
Drupal distributions for magazine and newspaper sites.
For additional useful materials on Drupal for Nonprofit Organizations, see Resource Guide: Drupal for Nonprofit Websites.
Drupal distributions for social and community sites.