This mod logs the last post you've seen of a thread.

On the forumindex, an arrow wil appear next to all the categories where there are new post you haven't seen.
When you click on that arrow, it will take you to that categorie.
On the bottom, you can click on "Mark all as read" to mark all the threads as read.
(It's best to do this right after the installation, because otherwise every thread is marked as "unread"

If a new post is added to the thread, an arrow wil appear next to that thread.
When you click on that arrow, it will take you to the last post you've seen. All the posts below are new then.
On the bottom, you can click on "Mark this forum as read" to mark all the threads of that category as read.

When you close or delete a thread, the info in the log database is also deleted.
When you delete a user, all his log info is also deleted.