Now, this may be a personal preference, but on the old forums, the "View new posts" link led me to viewing ALL unread posts. I greatly preferred that to where the "Show unread posts since last visit" link leads me, which is, well, to a page showing unread posts since my last visit. I understand that this may be preferable for some people, but occasionally, due to some sort of glitch, or something, unread posts since my last visit will be nothing, and I'll have to go to "view all unread posts" to see them. It's a minor inconvenience to have to click another link, but an inconvenience all the same. I just personally preferred when the link on the forum home led to all unread posts.
