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This is the final release of G2 Glossary for Drupal 5. It includes all changes in earlier versions of the 5.x-1.x branch and is equivalent to the head of that branch.
As such, it is a production-ready as one can get on Drupal 5, since Drupal 5 itself is no longer supported.
If you still have to use Drupal 5, this is the version you want, until you upgrade to Drupal 6 or 7.