[Zope] product recommendation; lightweight discussion board

[John Hunter]

I have a site that I am setting up where students can upload draft
versions of papers they are working on and receive feedback from the
other students and teaching assistants.  I would like to attach a
small, lightweight (preferably threaded) discussion/forum where
students can add comments, other students can respond to the comments,
etc... I would like to have a discussion associated with each
student's paper.

Suggestions?
John Hunter

Zope 2.5.x