I've worked on adding some feed links for individual forums and even individual thread tags - you can get to them by clicking onto a forum page or thread icon page and then finding our RSS feed from there.
(Some may be missing now, but they should fill in as we go - hopefully. If you want to subscribe to one and it isn't there, please contact me with the forum or tag name and I'll figure out if anything's buggy with the new code)
See Our Zed:
I see your one ad. How have the mighty fallen? Don't you know that one ad leads to another? And then another. And then another. Where will the adness stop?! I am heartbroken that you have taken this giant step backwards.