This week's ITWorld article The color of words concerns the non-use of color as a cognitive aid in word processing.
After twenty years in the SGML/XML markup trenches, I have come to the conclusion that for narrative-heavy structured documents, color coding inside an otherwise normal word processor has a lot to offer over more traditional in-your-face structured authoring approaches.
Take something like OpenOffice for example. A nice clean XML notation for the base files. Yummy. Now add a customisation layer to allow colour coding to be used instead of custom tags by authors/editors. Now add a two-way converstion from the colour coded markup to semantic markup and versa visa. Whaddaya got? A lot. Not least of which is a happy author/editor community - a rarity in the in-your-face semantic markup world.