I'm sure someone has already mentioned it, but I can't readily find where in this forum, so here I go on about it.
When you first opened this up for use it was easy to see what was new, but now it's almost impossible to tell where a new post is because the only indications I have about having viewed a post are:
1. my browser says history marks the thread as read,
2. the date of the latest post.
Neither of the above are any good because in the forum list and thread list the browser will show it if I've been to that thread or forum page in the last couple of weeks, even if there are posts there I've not read. And the date is only good if I can remember the exact date and time I last checked, and then I'm not sure if the forum is showing your date and time or mine.
With GG and the vBulletin forums I've used the system had ways to track and show me where there were posts I'd not read yet. That would be extremely useful to have. Already I'm starting to ignore some thread because it's too much of a hassle to open them all up to see if there's something new. That will lead to a lowered participation rate by some of us.