Private posts on a public community

I use my Imzy blog as a kind of journal among other things, in which I sometimes write about my daily life. Some of these posts are more personal than others, and there are things that, while I don't mind sharing them with the few people who have joined my community, I don't particularly want to share with the entire world.

I don't want to make my community private, but I would love to have the option to restrict some posts to members only. An even better feature would be the ability to create a list of people who are allowed to view private posts, but that may harder to implement.

Thanks for reading! I believe this feature would be useful for many people.