This satisfies the "plain ASCII text rules" bigots (in which camp I am still firmly entrenched) while taking advantage of the markup and linking facilities provided by PDF and HTML. (I've completely given up hope that Microsoft will ever acknowledge that non-flowed text/plain must be rendered with a mono-spaced font, fifty years of prior art be damned, eh?)
I'd like to include handy ERD, UML, etc... diagrams in PNG format to make the document more readable.
-andy