I've just posted a terrific new resource at the westciv site: HTML, XHTML, semantics and the future of the web, John's recent presentation from Open Publish 2004. I spoke to John after the presentation and he said he was a little bit worried when he asked his opening series of questions:
Who here is developing content that is valid XHTML 1 or 1.1? Who here is thinking about it? Who here thinks it is a waste of time and energy? Who here is thinking WTF is XHTML?
that his bluff might be called. The fact that the opposite was true shows that there is still a lot of upside if you're in the business of convincing management of the benefits of web standards.