As it is now, you can mount as many instances as you want, and you can grant the permissions that you want. On my company web site (
http://www.collaboraid.biz), we use it to host a shared blog, where we're all allowed to post.
Integrating with ratings is an obvious to-do. Also, general-comments isn't usable enough, as noted above.
It's currently not in the OACS repository, but if there's enogh interest, I could remove all the references to my name in the code and the name of the package, and stick it in there.
/Lars