When we look at the main purpose of corporate or business websites, it becomes apparent that their construction is very similar to static websites. The only difference is that they are much bigger (more pages and more content), and their design seems much more official. Also, most businesses like to publish some occasional announcements, so a blog-like functionality is required too (but it still won't be the main element on the site).
In essence, creating a quality corporate site with WordPress is all about picking (or building) the right theme. If you do a quick bit of research on the web, you'll see that most corporate sites (at least the good ones) feature hardly any design. The thing that makes them stand out is their very subtle branding (through a certain color scheme or clever use of logos) and stellar navigation layout.
What this...