I know phpBB allows this, but I'm not sure about SMF... is it possible to add a link to the page navigation that will jump to the first unread post in the topic? Or maybe just a different icon for unread posts? As topics get to 5+ pages it becomes time-consuming trying to figure out where I stopped reading last time.
edit: I just figured out the little blue "NEW" icon does this. I still feel like a change in appearance for read vs. unread posts would be helpful.