I've recently installed Jaxel's subforum grid listing template mod:
Now, "Diablo 3" is actually a forum. It can be posted in. However, if there are no unread posts, it will still display as having unread posts even if it doesn't, provided that any of it's subforums have at least one unread post.
My question is, is it possible to have "forum specific" read/unread markers for certain forums?