This may be old news, but the other day, I realized that you can submit articles to Associated Content that have been previously published elsewhere. So, I decided to start submitting most of my articles that I have published at EzineArticles (500+) and have noticed a significant increase in traffic from Associated Content coming through to my websites.
Now, they do work a little differently than most article directories. You can't really use a resource box, however, you can insert a text link within your article. My trick is to insert it as close to the top as possible, which I think is what's generating most of this additional traffic. I simply hyperlink one of my keywords with the URL to my website(s). It's really that easy.
Another plus is that you can earn performance payments based on the views that these previously published articles generate. It's not a lot of cash at all, but it's still some extra change for work already done.
Anyway, if you haven't done this, give it a shot. It might be worth it. Like I said, I've noticed quite a bit more traffic and have seen some increased sales and Adsense earnings since I've implemented this.