Voice Commenting (& MORE!) in Google Docs
Kaizena is not a new service; however, recently they updated some of the features that make it very appealing in a Google Apps for Education classroom. My favorite: The ability to add a "Resource" as a comment. This one step allows you to go out and find online resources, organize them, editorialize them, and then place them as comments into student work. Just think how much time that could save you!
Check out this great demonstration video on the new features:
Kaizena- Voice Comments and More!