Click on the the link in the blue bar at the top called "New Posts". No more visual cues are necessary (and you aren't limited to 5 threads per forum of information) because the page is all about what's new since your last visit. Furthermore, you can follow the forums you want by clicking on the "Follow Forum" button at the bottom of any page of threads within a forum, so ultimately you'll be able to be notified via alerts (and emails) about new content posted in only the forums you care about.