Article directory's are the good option for SEO purpose and help's a lot increasing the website ranking. You can add single article to multiple website by sniping article, there are lot's of directory which give's the do follow links and help's increasing rank.
Article marketing is one of the best methods of off-site seo. It helps in generating good quality traffic and helps in creating back links. Through articles, readers will know more about your business and services which you offer.
Submitting articles to dozens of different article directory sites is really helpful in link building, so feel free to do it!