This release fixes a security vulnerability, all users of cvs.module (4.7.x-1.0 or 4.7.0 from before the new release system) are urged to upgrade. For more details, see DRUPAL-SA-2006-028.
This release includes a new database update: cvs_update_5() which removes a stale entry from the {variable} table. After you upgrade, you should run update.php for your site.
The 6.x series of Drupal core is our legacy stable release. Bug fixes and security patches are maintained in the 6.x branch of our Git repository.
Production sites are encouraged to use the official releases; however, to provide testers easier access to these bug fixes that are on their way to becoming the next 6.x release, we generate a tarball from the 6.x Git branch twice a day.