the best way to learn how site feeds work is by using em.
Instalation: Restart firefox after sage is instaled
Usage of sage & firefox:
First find an XML
icon on a wepage. (You must have seen one by now)
now click: v
iew > side
bar > sage > click the hour glass > and add the feed
The rest speaks for itself.
in this posting
you should discover a lot of feeds, go try it out and post me a comment or a question.