When we did a post on the benefits of niche social media sites, we talked about how industry-specific sites can actually be more useful than World Wide Web monsters like Digg or del.icio.us, because the audience is more select and made up of your target customers. Affiliate marketing article directory AffSphere is beneficial in a similar way. It’s article marketing directed at affiliate marketers for the purpose of boosting affiliate marketing business. You get the basic returns of article marketing – exposure, backlinks, traffic – plus the industry advantages, like including your affiliate links in the article, getting credits for advertising with each submission, and connecting with AdSense accounts.