The new article distribution service, ArticleMarketingAutomation.com has just launched a competition to expand their list of sites where they publish articles. They've put $8,000+ in prizes up for grabs for the people who can add the most sites to their network. It doesn't cost a thing to join and add sites. The only requirement seems to be that a site must have an XML-RPC remote publishing API, such as the built-in API of WordPress. If you join for a free account now, you also get a 7-day free trial of the paid section of their service. Their URL is http://www.articlemarketingautomation.com (non-aff link). Read about the Site Smackdown Competition here: http://blog.articlemarketingautomation.com/ama-site-smackdown-competition-over-8000-in-prizes
I've tried it, and it works fine. However it seems like the article submisions have slowed down after the first month and I have cancelled my subscription. I might start again at some point.