Drupal Online Ticket Response System(OTRS) | drupal.org : This modules allows the integration of OTRS 2.0+ (Online Ticket Response System) with Drupal to provide a mechanism for organizations to track the detection, reporting, and resolutions of problems/issues.
I've been testing and evaluating Drupal as it moved toward release 5.x. Its got lots of great features that should make my new sites much more powerful. It should also add some great functionality to my old sites after they have been converted.