This is a new release on a new branch of the code with new functionality. This release is a stepping stone towards the 6.x release which will be coming soon. If you currently use comment_notify you will need to upgrade to the 2.x version of the code prior to upgrading to 6.x-1.0. Once this version has known users who upgraded successfully then I will be able to create and release the 6.x-1.0 version of this module.
This new branch also attempts to provide PostgreSQL compliance. If you were avoiding this module because of a lack of PostgreSQL support, please help test this new version so we can make it compatible with both databases.
New Features Since the 5.x-1.x version of Comment Notify
removing code style issues found by the coder module - thanks, Doug, Stella, Sun, and ezyang
feature #171034 by greggles: if emails are not required by drupal, validate the comment submit form to require emails if they try to get comment notification
feature #192325 by greggles: provide a permission for comment notify usage
feature #264584 by greggles: Limit Comment Notify to Certain Node Types
feature #229582 by greggles: Don't notify registered users by default - let them opt-in and provide help to change the default.
feature #232564 by greggles: refactor data structure so core tables are not altered and move towards PostgreSQL compliance