BSP is a Mac OS X system preference pane that allows you to configure additional categories into Spotlight. When Spotlight has search results that don't fit into one of its pre-defined groups, it sticks the files into the generic Documents listing. With BSP, you can add new categories and assign file types to them. Documents will appear in the search results in their new groups, making them easier to find and work with. You can even edit, rename, or delete the pre-defined Spotlight categories, giving you complete control of the search results display.