Since having moved to IP.Board the posts in each board show up as unread. As before click on the image to see the larger size.

To mark an entire Forum as Read look for Mark this forum as read up on the right side of each individual forum.

Now it will just show threads as unread if there are new posts since your last log in.

You can also mark forums read on the index page.

The first way, for individual forums, is to simply click the new post icon next to the forum name.

The second way is to scroll to the bottom of the page and click the Mark Board as Read link. Then all forums will be read.