Dr. Peter Jones shares his “Top 5 Web Myths” and they are wonderful and worth a read.
Top 5 Web Myths Myth #1: You start with a design and layout, then start filling it with content.
In fact, the main and primary task of building a website is creating good content and keeping it up to date, which has little or nothing to do with design and layout. The main job of graphic design is to enhance and not hinder usability of said content. Only then is the designer free to find ways to add a professional appearance to the website.
It’s like making furniture. You wouldn’t make a varnish shell and then add wood, but that’s what most people try to do with websites. You’d cut and assemble the wood (create content), round the sharp corners and sand it smooth (design for usability), and finally add a glossy finish to it (design for a professional look).