Google adds "Discussions" into its cloud-based word processing service, Docs-- a shared commenting system some describe as a less complicated Google Wave.
The comment/chat feature allows multiple users to edit a single document (even simultaneously). Users can also invite new collaborators by simply putting their email address in a message-- while the system sends email notifications when one receives a reply to a thread or comment. Separate chat can also go on while users edit the document in Continue reading...