There's another feature that was put in a while ago, but I'm updating the styling a little. It's the way read/unread threads a shown. Here's a run-down.
1. If you've never read a thread it has a bold title.
2. If you've completely read a thread then it is faded.
3. If you've read a thread, but it has new posts then you'll see the yellow new count.
This is a little counter-intuitive to folks that are in the habit of reading every thread in a forum. But for more casual users we've found that it's nicer for them to not have to see a sea of yellow icons when they first visit a forum.
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