Send one off announcement emails to registered users.
Personalisation, profile info is added into email.
Plain text or HTML email (subscriber chooses which to receive).
Announcement message can use Drupal input formats, e.g. use PHP to create a conditional plain text email
Bounced email handling.
Email link authentication - 'Read more' links, and account control links, allow users to access the site (based on their role) and their email subscription settings, but without accessing their full site account.
100% built for Drupal.
*** Note: I broke some of the functionality of this module while converting it into multiple components, so it's not ready for use - will be fixing things again ASAP. Committing to cvs to allow others to collaborate on development.