Do you have your favorite article submissions web sites, the ones that get you results? A few that I like are ezinearticles.com, goarticles.com and International Practice Articles.
However, you should remember that different articles on different topics can produce different reponse rates. For example, some of my articles are re-printed more and used more on other web sites then others.
Your best bet is to track performance for different articles across different directories, and see which ones perform better.
And don’t forget to use other online marketing techniques – business blogging, newsletter publishing, search engine optimization – to supplement article promotion.
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