Sorry about that; I wrote the first thing that came to my mind, which probably made little sense to most people here (given the international scope of this list). My apologies.
What I was trying to say was that the nxml-mode package provides many useful features, and makes it much easier to write XML-based documents. I've only been testing it out for an hour or so total, but already it seems to be overwhelmingly superior to the other packages I've tried. :)
Thanks James :-) And I agree 100% btw.