Last year Moodlerooms released their Advanced Forums plugin to the Moodle.org addon repository. Here’s a follow up video that highlights just what the features are and why you might like to be able to sort threads in different ways or manage subscriptions to individual threads in a full forum. Pretty slick.
Download the plugin from https://moodle.org/plugins/view.php?plugin=mod_hsuforum
Video: http://www.youtube.com/watch?v=FrZ3xNe1xB4