I’ve been looking at the LSU gradebook, as MDL-17807 has lots of votes. The simple grader report is really nice, with the option to scroll grades while students stay fixed, and quick editing for fast paced editing of grades for either grade items or students.
I’ve also been learning more about the flexibility of the Moodle 1.9 gradebook. Alternative reports can easily be added as plugins, with visibility controlled by a capability.
Please see the work-in-progress Development:Gradebook improvements for proposed gradebook improvements based on the list of popular gradebook issues. (Remember to vote for the issues you most want to see fixed!)