glFusion implements a core subscription system that can be utilized by plugins. Now, under the My Account settings there is a new tab labeled 'Subscriptions'. This one place allows the user to manage all of their subscriptions.
Both the Forum and Media Gallery plugins have implemented the new subscription system.
The Forum subscription user interface has not changed, but behind the scenes it is now using the glFusion subscription system.
Media Gallery Subscriptions
User's can now subscribe to an album so they are alerted whenever a new upload is made to that album.
User's can now subscribe to any comment thread and be notified via email when a new comment is entered.