I created a test RSS feed for the "Setup, I/O, and Basic questions" forum. The URL for the feed is:http://www.charmm.org/ubbthreads-7-5-3/cache/rss20.xml
There are a couple of different ways to set up the feed (to update on new posts or new topics). I think that traffic is low enough that updating on new posts is OK, but if anyone has a different idea I'm glad to hear it.
I'd appreciate it if someone could test the one feed that I made, and then I'll go ahead and make feeds for the other forums.