In many of the thread listings, specific to a user (such as the "new replies to your posts"), it would be nice to have an additional column with the number of new posts. So often, I end up looking a thread just to see that only 1 new post was made, when I'd like to wait until 3-4 new posts are made (minimize context switching). The total number of posts column could be replaced with this one... who remembers / cares what is the total post count (in that display) as it is shown when viewing the actual thread.
For the InfoQube community web site, I use Drupal and it shows in red, the number of new posts. I find this very useful