I would LOVE to be able to see which assignments I have already listened to when I'm grading. Even now, as I type this post, I have lost track of exactly which student I was on in reviewing their submissions. I listen to each recording and, unless I sit down after the assignment is no longer available to the students, there is no way for me to tell which pieces I have already listened to and commented on without clicking on each assignment to see if I have made comments (commenting is my ONLY way to keep track of which recordings I have already reviewed). Maybe just a little check in the box or a plus sign. This would let me see quickly which assignments for each student I have already heard/reviewed.