On any given thread page, at the bottom, you'll find something like this:
Read Messages: This Forum: Older: New Style URL display
Perhaps it's already known, but there are no longer any "Newer" links to the next thread (when there is a newer thread, obviously).
And while I'm here & talking about that section of thread pages: I've never brought it up but I miss (and often used) the "Global" (as opposed to "This Forum") newer/older links. In a testament to the strength of a well-written title, those intriguing Global links took me to places on WebmasterWorld that I don't normal visit, never mind hang out at (such as the Mac Webmaster forum). And I've learned more as a result! :)
So, consider this a vote for both Forum & Global links!