I just updated to 3.0 and I noticed that private posts were no longer showing up in the list of recent articles when I logged in. Furthermore, when I went into the admin and clicked View under any existing private post, I got an error 404 page. In sum, it is no longer possible to view any private post except in the editor.
I tried creating a new post and marking it private. This didn't work either. If I remove the privacy setting on the post, it does reappear.