Right, this is a suggestion I'm making. To be more specific, I would recommend an alternate view which sorts threads by when their OP date/time. So essentially, you could have two primary ways to view the latest activity: 1) by the latest posts 2) by the latest threads
To get even more specific (again, just a suggestion based on experience in other blogs), when listing the threads, identify how many posts were made and how many unread posts were made (so you can tell if there have been posts made to a thread since the last time you viewed it).
This way, you can quickly peruse a comprehensive listing of the latest threads and determine which ones you haven't looked at yet.