I’ve been collaborating on a project with another writer, as well as three remote stakeholders — all of whom need to see, comment on, and approve some online copy. We’ve found Google’s online wordprocessing tool — Writely.com — great for this.
You open an account, save your documents and invite the other people who need to view them to sign up wth their own login. Everyone’s comments are visible to all invitees for a particular document, and anyone can make amends, leave suggestions, etc. Chalk another one up to Google — it’s really a very handy tool.