There are free resources and then there are free resources for submitting your articles, but it makes sense to submit posts to websites with ranking equal or higher than yours.
Here is a list of websites with a page rank of 6 or higher where you can submit your articles for FREE!!
https://www.advisor.com
http://www.allfreelancework.com
http://www.articlecity.com
http://www.articledashboard.com
http://biz-whiz.com
http://www.blogwidow.com
http://www.chiff.com
http://www.digital-women.com
http://www.ezinearticles.com
http://www.goarticles.com
http://www.marketingsource.com
http://www.powerhomebiz.com
http://sbinformation.about.com
http://www.searchguild.com
http://www.selfgrowth.com
http://www.selfseo.com
http://www.sierratimes.com
http://www.weeno.com
NOTE: Headsetoptions.org and Mandarinmusing.com both have a page rank of 6.0+ and we will publish your post if you are interested. We don’t care what your pagerank is, our only critieria is quality based content. If you have interesting updates on WordPress themes, WordPress Plugins, Web 2.0, SEO, SEM, other web resources, you can contribute what you have, as a regular guest author or otherwise. Thanks!