Topics (what we used to call threads) that you haven't read yet, or that have new content you haven't seen) have a red logo next to them on the main page (the icon that shows a page of text -- it's black when you've read all, and red when there's new content).
The cool thing is that you can click on the really tiny little icon that's to the right of this (just left of the topic title) and it takes you to the first of the posts you haven't read. Cool!
Use this topic to post any other nice features you've found on our new forum software,
Dave