if you are looking to paid seo friently FREE article directory script then go for: articledashboard.com i think its the best of its kind and easy to setup and maintain....
ye i agree with infogle . article dashboard is the best one i too use on article-directory.co.in others are articlefriendlyms something
if you can spemd $149 i will recomande you this: http://www.alstrasoft.com/article_manager.htm i like it
I think articledashboard is good, I downloaded it, and if you have a little bit of code, you can modify it. that's is good script for everyone
I also feel that the article dashboard is a nice script and can be custom modded as per the requirements and also the best thing is that it is FREE.