Rather a personal note…
With qPloneComments installed in Quills 0.9 comments worked out of the box even for anonymous users. With the upgrade to Quills 1.5 aka trunk I had to find out that this is no longer the case.
Here, comments must be enabled for the WeblogEntry portal type. Unfortunately, this is not (not yet?) possible via the plone preference panel. Insterad, go to your site instance in the ZMI and then to the portal_types tool. Select the content type for which you want to enable comments and change the option enable discussion as needed.
That’s it 🙂