On a forum I occasionally visit, after causing some trouble, I noticed that have this brilliant feature called an "Admin Contact Forum". It works like a sort of like a pastebin. Anyone may start topics in the forum, but only the starter, and admins, can view that topic.
Good for contacting Admins on private issues instead of E-mail / PMs.
See my signature... View Topic permissions mod... You can setup board specific permissions and allow only thread starters to view topics they posted in that board... it has many other uses as well since it is permission based.