A lot of the articles and videos produced by Google and Matt Cutts give an insight into where Google are going with how they determine search rankings.
If Article Marketing is something that you put a lot of effort into, then I’d suggest looking at other strategies as this isn’t going to be a sustainable SEO strategy. Last week, Matt released this video in response to the question:
“Do you recommend article marketing as an SEO strategy and how are the backlinks treated when other websites republish the same article?”