Is is still a good idea to submit an article to more than 1 article directory, considering that google penalizes sites with what they call duplicate content?
Only in very extreme cases of duplicate content will Google issue a penalty. The worst case scenerio is that some of your articles will appear in the omitted results or not be indexed at all. Submit to the most popular article directories and keep an eye on results before submitting to the lesser known directories.
It's better, if change the article contents, otherwise Google may penalize. You can read this post How to Avoid Blog or Website Penalization from Google to keep away yourself from making any mistake which lead to Google penalization.
Its not advisable to submit 1 unique article to different article directories, for it will loss it value of uniqueness.
Well braver55b, since you're not submitting the articles to rank the URL from the article directories, and instead you're using this articles directories to generate one way link to your site, then it's ok if you submit the same article to a lot of article directories sites...
What to do is write one article and play with its and change few words up and down . Try to submit your article only in good directories which is well known .
Don''t advise you to submit duplicated contents, as Google won't index them, so what is the point of doing it? Just try to rewrite it manually or use some tool like Unique Article Wizards to help you to generate unique contents....
This problem has discussed many times in DP. Please move to Copywriting category to see more details.
You can submit articles to as many directories as you want. But I suggest you only submit them to the top directories only. And never worry about the duplicate content problem. The worst that can happen is that google will not count backlinks on same articles, posted on different directories. If google used to penalize sites for getting backlinks from the same articles but from different directories, then people will start to do article marketing to thousands of directories for their competitors in order to get them penalized.
I would say find your favorite article directory and submit your article only there because Google has changed the algorithms and it penalizes the duplicated articles.