I don't think article marketing will work in the future as it has in the past. Anything that was working in 2010 needs to be reconsidered.
The only articles for other sites that could have value are on non-article sites. So write an article, just ask ONE webmaster whose site is relevant to yours to publish it (with the links). That would be my advice - or just put the article on your own site.
I've stopped writing articles for article sites. Too risky - even if they are 100% original content.