It seems like someone that says they can write on SEO and directory submissions would be able to use those skills to figure out sites that take submissions relevant to the terms they can write about......
This forum is related to several sites that take contributed content. Most of the content we look for is around programming or web development topics. For example, I know we are looking for HTML5 and CSS3 articles right now. We also take articles on a variety of other topics as well. If you are interested, you should state what your skill set is (list of technologies or topics you are qualified to write about).
Director, Developer.com Network