In current WordPress, the only way for a comment to remain private is for it to stay in an βunapprovedβ status. It would be nice if comments could flow more easily between unapproved, private, and public.
Ideally:
When someone leaves a comment, an option is available to submit the comment as private so that only the post author will see it.
When a post author moderates a comment, an option is available to make it private.
A post author has the ability to privately reply to a public or private comment within the WordPress admin.
Jeremy, I really like the idea of private comments. I guess this is a part of the wider discussion around private posts.