This is the first official release of the 5.x-2.* series. The major new feature here is that issue followups now use core comments, instead of the previous special-case pseudo comments. This means the project_issue now depends on comment.module, upload.module (for file attachments to the initial issue post), and the comment_upload.module (for file attachments to followup comments).
This release requires Drupal 5.2 or greater.
Users of the 5.x-2.x-dev release should upgrade to this version immediately, since it fixes some critical security flaws: