Card FileAt the bottom of your forum you should see the card file link, by clicking on it puts your forum in card file mode.
When you first click the link you will see no difference until you enter a category.
Card File Mode
So what does it do, well it lists all your topics in alphabetically order so all the topics beginning with A are under A and so on.
As you can see here if i click on S
And thats HOWTODOIT