This issue has come up a few times in previous threads - but it seems to be getting buried.
Overall the new organization is good (okay, the text should be a little smaller) - with one problem that is really detracting from the site for me.
I find it impossible to effectively keep up with multiple threads because there is no way (that I am aware of) to know if I have read the thread in its entirety or if there have been new replies since I last looked. On the old site this was immediately obvious since each reply had a link, and once I'd read it the link was a different color - no problems and I could tell at a glance if any thread I had read over the last couple weeks had been updated.
With the new organization this feature is gone and replaced with the 'latest reply' heading and the bookmark to my CHOW option. These are essentially useless for this purpose since I still don't know if the latest reply came before or after I last checked the thread. Bookmarking to my CHOW does nothing to help as - again - I still don't know if it has been updated since I last read it. Bookmarking to my CHOW is a good thing, though.
The obvious solution is a color change to the thread once clicked. Of course the color must change to the 'unread' color if the thread is updated. Another possibility is to have a subheading listing 'thread updated X hours ago by Poster' - which would at least give you some idea if it is worthwhile to click the thread again. In combination with bookmarking to my CHOW, these changes would make the site much, much better IMO.