Branding
Company branding is just as important as a quality web site.  Branding portrays to your client what your company is about. 
 
SEO (search engine optimization)
Search Engine Optimization is just about as important as a great web site.   Once your on the web, you need to be found.   I develope my sites with SEO in mind, I use proper keywords and tags to gain optimization with google and other search engines.
 
Web Development
Web Design is not all about how the site looks, its about the usability to your visitors. Developing a web site to be standard compliant and user friendly is an important aspect of developing your site to make it fast and structuraly sound.