Ok, the RSS feed should now be 100% up and working. You can get a feed of either:
- all the latest posts of all the forum;
- all the latest posts in a single forum section (e.g. "News and Updates");
- all the latest posts in a single topic.
No you can't get a feed of all the latest posts in a category (e.g. "Important things").
By default only public posts are shown; if you want to get the RSS feed of a private subforum (such as Off-Topic or the Staff Lounge) you will be required to authenticate, however the RSS module will try to read your forum cookies first.
I'll keep this topic open so you can report any problems, should they arise. I already know of one, but it's quite minor so I don't think many people will notice it (besides, I can't fix it).