great article that explains why print has caused designers to design their pages upside down...
It also helps explain a phenomenon I've seen in user testing I call "land and scroll" Users come to a page and --before it's even finished loading, as soon as they have anything vaguely resembling a page-- they scroll. I've seen a quick up-down "getting the lay of the land" and a permanent scroll-to-content, pusing the global nav, banners and logo off the screen. hmmm