[Request] Post visibility plugin

Greetings WPMU DEV staff and fellow members!

I've got a request to make here. I would love to see a plugin that would allow you to set the visibility status of a post to more than just all, those who know the password, or just admins and editors. I'd much rather see this:

* Public
* Members only (any member can see a post, guests cannot see the post at all)
* Staff Only (only admins and editors can see - like current private setting)
* Only author

It would allow for the posting of sensitive topics to just the members (or staff) of a site, and keep general public from reading them.

Just my idea, let me know what you think. :wink: