I often rummage through the Student Progress pages looking for students who are struggling with a problem (many attempts and no correct answer yet), a problem that many students do not have correct, etc.
Sometimes I'll open a student's quiz to see what is happening and I'll find something that I could help them with. It would be nice if there were an Email the Student button for me just like there is an Email the Instructor Button for them. That way, when I e-mail them with a hint or something, they can click a link that takes them directly to the problem.
Cheers.