Quiz manual grading report
The manual grading report may be viewed by clicking the quiz in question and then accessing Administration> Quiz administration >Results > Manual grading
The first screen of the report lists all the questions in the quiz that need to be, or have been, manually graded (for example essay questions) with the number of attempts. There is an option to also show the questions that have been automatically graded, which if useful if you ever need to edit the grades by hand.
Note that since Moodle 2.5.3 it is possible to order attempts by student first and last names along with previously available options: