Here's another tool that might be useful for educators preparing papers for publication, etc. :
QuickTopic Document Review - QuickTopic bulletin board:
"You've authored a document and you'd like your peers to review it. Quick Doc ReviewSM gives you an instant private space for gathering comments on any HTML document (Microsoft Word documents too). Your group can comment on each paragraph, directly within the document, and you can also display, sort, and print the comments separately. Comments are all in one central place. This is true collaboration, much better than mailing documents around and having people make comments in isolation. And it's private, but still easy to access."