Take a look at SigmaPro.  It's been here since DNN 1.1 and currently at version 6.5.  More information is located at:

http://onyaktech.com/Modules/AllOnyakTechProducts/tabid/373/ProductID/79/Default.aspx

Or - www.SigmaProDraconis.com 

Key Features:

• Include Ticket Links in Email Notifications
• File Manager
• Recycling Bin
• Knowledge Base
• Software Releases
• Help Desk Menu
• Software Menu
• Administration Menu
• Project Templates
• Custom Priorities Values
• Custom Status Values
• Project Dashboard
• Time & Cost Tracking
• Team Management
• HTML Ticket Comments
• Project Phases
• Disable visibility of fields, menu options and more
• Assign Custom Forms to the Project or the Ticket level
• Create custom Categories and relate them in hierarchal tree
• Automatic Detection of the current DNN User
• Personalize the Ticket View by adding/removing columns
• Ticket History Log
• Project Setup Wizard
• Control the display of fields and information for Help Desk setups or secured projects.
• Project Cost, Budget & Savings Tracking
• Move Tickets between projects or relate them
• Attach Files to Tickets.  Stored in SQL Server.
• Project and Team Vision Statements
• Attach Skills and Skill Level to Team Members
• Set the average cost per hour of Team Members for increased accuracy of Time Cost Management
• Automatic Capacity Tracking
• Automatic Availability Processing
• Automatic Reliability Processing
• Incident Management
• Ticket Escalation
• Custom Reports
• Custom Fields
• Custom Forms
• Email Templates (10 Keywords plus Custom Fields)

Components Included in SigmaPro 6.0:

• Help Desk Add-On: A module that simplifies the Help Desk configurations and setup for SigmaPro. This module is very simple and easy to use.  Use the core SigmaPro module for administration while using this add-on module for your end-users to interact with.

• Email Monitor: Monitors a POP3 Server for new emails.  Parses all new emails and create new tickets.  Also detects responses and updates the related ticket.  This is a Windows application that runs in the background and is accessible from the Windows Tray. Includes a SPAM Filter.

• Plug-In Manager: A module for managing your SigmaPro Plug-Ins.

• SigmaView: A module that displays the current items in a project you specify.  Perfect for sharing project information without the ability to edit the data.  Also contains a link to download the data to Microsoft Excel.

• SigmaPro Web Service:  Used by SigmaEx and SigmaPro VSIP.  Also a great tool for extending SigmaPro.  Easily build new applications or modify existing applications to interact with SigmaPro on your DotNetNuke web site.

• SigmaPro DotNetNuke Dash:  A Windows Mobile 5.0 application that gives you real-time stats of your projects, ability to post comments to tasks, view current users online and even an optional display of current orders for those using Catalook.

• SigmaEx: Windows application for reporting and analyzing data from SigmaPro.  Includes the ability to export data betwen SigmaPro and Microsoft Project, dashboard with gages & charts, view real-time data or work with downloaded SigmaPro Projects