Jeffrey Zeldman’s presentation on Designing With Web Standards has been posted to the web. I’m in the process of reading his book with the same name and find it very inspiring, which is an odd (yet great!) thing to say about a book on xhtml and css design. He lays out very clearly why standards are important, not just from a technological point of view but more so on the costs savings, greater efficiency and increases accessibility that can be achieved by adhering to standards. View the presentation and buy the book!