Why do that? (NYPL online style guide to XHTML) Here's why. (Jeff Veen's The Business Value of Web Standards)
JJG and Peter Morville Information Architecture principles. S.R. Ranganathan quote "To be literate is to possess the cow of plenty"
(obscurely positioned where most do not see it: )
The reasonable man adapts himself to the world, the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
– George Bernard Shaw
I've had this quote up at work for at least the last two jobs.