This is a screencast I created in Windows Media format that descibes how to export the content from a discussion board forum in Blackboard to Microsoft Word. This means that even after a class has ended and the course has been removed form Blackboard that you have the ability to view a discussion board, save it, print it, edit it, comment it, use parts of it for other types of presentations, and do pretty much anything you would do with a regular Word document.
The screencast is here: Discussion Board Export to Word Document