Here’s a great video by Mary Cooch that highlights one of the new features in Moodle 2.2: the creation and use of Rubrics for assignments. Rubrics provide a granular grading approach and enables writing/composition teachers to grade on various criteria within a single assignment (no need for multiple gradebook entries per paper). This is a huge value-add to the Moodle grade center.
For some excellent documentation on the Rubrics and advanced grading features check out the docs: http://docs.moodle.org/dev/Advanced_grading_methods.
Watch the full video here: http://www.youtube.com/watch?v=KXavtUhDINA