This course block shows information about highest grades in a course on some grade item. It was created on the base of quiz results block, but instead of quiz results it shows information about any grades in a course: course item grades, grade category results or whole course grades. Block title, header and footer can be changed in settings as well as grade item to show and other settings.
This block was already posted here: http://moodle.org/mod/data/view.php?d=13&rid=2079&filter=1