Last week my daughter showed me one of her assignments from college where she created a resume and was given audio feedback from the professor. I believe the University uses Moodle/Turnitin. Later that day I say a tweet on Kaizena which allows you to download an app from the chrome store in order to add audio notes. I found that Richard Bryne's had posted a reveiew on his blog and a great screencast overview from Stacey Behmner's video .
Note: WIth Kaizen you have to authorized it to access your Google Account and allow access to your microphone, like many other applications now require.
I plan to work with a teacher this week to see if you can replicate the assignment using Google Drive, templates and Kaizena. I will update later in the week!
Note: Google is also testing "Using voice recognition to type (beta)"
Chrome Store learn more here.