In my opinion, one of the most important things you can do to drive traffic to your website and increase your rank on Google is to add a blog or article section to the website.
Adding a few articles a month with information regarding anything to do with your industry is a great way to attract people searching for those terms. These articles will rank very high in Google because they have a wealth of information that is consistent with the product and services that you provide.
When somebody in your industry is Googling for that information, your articles will show up because they are relevant to their search.
While reading the article the customer is not only happy to have found a great source of information but also will realize that they are actually on a website that provides the products and services they were searching for in the first place. These people often convert to new customers.