Im so pleased with how things are moving along.
Regarding the collab suggestion, I work at Box.net, and based on my
experience with Zoho, I would advise against it. The best
collaboration writing tool Ive found so far is google docs.
However, I think the assignment based approach is the best. When each
person uploads a chapter to Box.net (as a word doc), if someone has
revisions, upload it with comments and box will store each version of
the file. Or use the wiki or webdocs in
box.net to leave notes for the
author (probably the best idea)
Aaron