I was messing with importing RSS feeds to my AC 3DS Blog so Jeremy turned them on so we could test them earlier. Basically the RSS feeds contain the first post of about the first 8 threads in the forum the feed is for. You can use this to import content from the forum into other things.
For example if you input this feed url (
http://www.belltreeforums.com/external.php?type=RSS2&forumids=2) into Google Reader then you'll be subscribed to the latest threads made in the Bell Tree HQ board. That's not exactly how the blog would use them but it's an example of what RSS feeds can do.
tldr: don't worry about it, you can ignore them