I just committed a big patch to Typo that adds the first part of a notification framework. This piece adds the ability to send email or Jabber messages whenever certain events happen. The events currently supported are new article creation and new comment posts.
This is still a work-in-progress, but it should be safe for a few brave people to use. You’ll have to edit your user settings in Typo to configure your notification settings and then edit the general settings to configure which email address Typo should use. After that, it should just work.