Well, it is my belief that XML feeds are "Live Bookmarks", bookmarks which will give you a list of the most updates news, information, or, on forums, topics.
In Firefox, they look like a links folder and you can view and click on the most recent topics. I just created a AOTR live bookmark and it displays only the five most recently updated topics.
Click
here for an image of what the AOTR live bookmark (on Firefox) looks like.