The Views Bulk Operations (VBO) module is a great extension for the Views module, which allows you to add bulk operation checkboxes and actions to any view. You often see bulk operations on various Drupal core administration pages, like the content administration screen, which lets you select multiple pieces of content, and then perform an action, like publishing or deleting, on all items at the same time. VBO lets you add this to your administrative screens, which allows you to create very customized reports that also have time-saving actions available to them as well.