I've rolled out a new forums feature: accurate marking of which threads and comments are read/unread.
The old mechanism by Bagpuss used cookies to track which threads you read, but that didn't allow for tracking new posts to existing threads, and was generally limited anyway due the maximum size of a cookie's value.
The new system is active for anyone who ticks the 'Remember Me' box upon making a new post, ie. with the board login/password cookie (bearkey-pw in your cookies list). This corresponds with your user ID and new tables in the database now store your last visit to each thread, and the last time you used the new Mark All Read button.
Threads are shown in the Topics listing with a red star when you've never visited (or marked) it, and when there are one or more new posts since your last visit. Individual comments in a thread are similarly shown with a red star when they're new.
Boards in the Forums index are shown with a red star when any thread has a new post since the last time that you visited any thread (or marked all topics read), but it won't be able to remember that you didn't read any older threads yet.
If your board cookie isn't set, the system falls back onto the old cookie-based mechanism.
I hope this (further) increases your enjoyment of using the Blue's News forums.