I recently have fallen in love with Google Voice. This new tool(or at least new to me) allows you to record your voice to Google Documents. I love this to give feedback and insight to student work. It allows me to share my thoughts while grading instead of having to type everything up. It allows me to connect with many kids at once when we are collaboratively working on a document. On days I am absent I can leave my voice to give them direction and tips.
It is a great tool and must have to use if using Google Drive.
Here is a little tutorial explaining how it works and how to get started. Let me know what you think.