Don’t forget to update your Drupal [3] sites with the latest version
Release notes: [4]
Maintenance release of the Drupal 7 series. Includes fixes for incompatibilities introduced in the Drupal 7.20 [5] security release only.
Download: http://drupal.org/download [6]
Links:
[1] http://linux.philosweb.com/drupal/category/it/drupal
[2] http://linux.philosweb.com/drupal/category/it/open-source-foss
[3] http://drupal.org/
[4] http://drupal.org/drupal-7.21-release-notes
[5] http://drupal.org/drupal-7.20-release-notes
[6] http://drupal.org/download