Well we know that Word is heading toward some form of extensible foundation and that users' experiences will be predominantly seamless, so there's an example of average users who won't touch markup, in a very visible product. There's not a handy CSS/XHTML WYSIWYG editor out there yet... is there?
But the XHTML/CSS example posted above is what derailed me from trying it for more than a year.
CSS Zen Garden and Jon Hicks are the things that turned me and kajillions of other designers around.
But if somebody is bloody asking for MARQUEE then stand aside, hand them the dynamite and let them run out into the trenches!!