To get the best results you should have a different headline for each article directory. You should also change the first 4 or 5 sentences and the last 4 or 5 sentences of your article. That's only for getting the article listed in the search engines multiple times. If you are lazy, then you can simply submit your article as it is to many directories. It will be listed in each directory but only listed once or twice by the search engines (in most cases).
I am preaching to use the
digiXMAS Article SubmitterIt is for free plus it rotates all the headlines you enter, plus it rotates all the article-snipplets, plus it rotates different signature lines with each article that you submit. The submission happens semi-automated and includes hundreds of article directories. I am using this tool plus I hand-submit to ezinearticles and 3 other big ones that are not included in the software.
Guido