Purchase billboard, radio and television advertising. Write articles for business newspapers, or be a guest on radio and television shows. Create an affiliate program for your site. If properly executed, this will explode your site across the internet. Give away items from your website.
Free sites generate a tremendous amount of traffic.
If your goal is to sell a specific product, all the above strategies would work. Targeted e-zine advertising. Purchase the exclusive space in several e-zines. Have a specific sales page for each product. For example, if you are selling a home improvement book, create a sales page that sells only the book.