As what Rob1n mentioned, on the 'New Posts' results, you click on the 'replies' part of the thread and vBulletin takes you to your first unread post on that thread. I think it's a neater solution since you know what the topic of the thread is first, and you can decide whether to read the latest post in it or not. If new posts are displayed instead of threads, then you'll have more pages to go through.