I dont know of any pre-packaged solutions personally but id recommend building it yourself if you know php. It would be very simple.
Id have a form with name, email, comment fields and have that submit to a script that validates the input and correctly escapes all the user info and then inputs it in to a db table ( id add a timestamp of NOW() also so you can echo that out later).
Then on the page where you want the comments to appear you can select all the data needed from the db and order it by the date submitted. When you're echoing out the comments you can output them in to whatever markup you want....perhaps a definition list might be semantically most appropriate here?