Google Doc Discussions for Hybrid Learning

Google Doc Discussions for Hybrid Learning:

http://www.brokenairplane.com/

"Google Documents rock! Where else can you get a free document editor that you can share and collaborate with others? Recently, Google released Discussions which were an improvement on the comments you could embed within a document. With discussions, you could leave a comment and have it be sent to a recipient, who could in turn reply in conversational form. Now students could work together to refine their work and teachers could give feedback all leading toward beautiful work."