Just a quick update for those who use Google Drive and have students who use Google Docs for assignments, especially their papers and essays. You can now leave voice comments. I am not sure this is always the best way to leave comments as leaving written comments in the line can be more direct with students, but leaving them some verbal/voice feedback can also personalize the experience more. You might even assign them the task of leaving verbal comments back. Either way, kind of a neat feature to play around with. It does take some set up, so here is a blog post by Richard Byrne of Free Technology for Teachers to with a video that explains how to do this process.
Richard Byrne's blog post on Google Drive/Docs voice comments click here!