You’re better off submitting one unique article to each article directory, versus the ’same’ article to many. . . .

Now, some will say that by submitting the ’same article’ to a wide variety of article directories, one opens up the issue of what is called ‘Duplicate Content”. . . . Which is true to a certain extent, that is unless all links from that one article lead back to the same place. . . When that happens, THEN you run into the ‘duplicate content issue’.

On the other hand, if you can mix/match the links that appear in the article itself OR the Authors Bio Box to other resources, then you’re fine.

Example:
Say I write a 500 word article, I would then go get a 15 day trial of the software app “Power Article Writer” (www.Powerarticlewriter.com) and use it to ’spin’ that article at least 10 times, thus giving me a total of 11 articles.

I would then take spun article 1 (SA1) and go to Squidoo.com and create a ‘lens’ on it.
I would then take spun article 2 (SA2) and go to HubPages.com and create a “hub” on it.
I would then take spun article 3 (SA3) and go to Wordpress.com and create a blog around it.
I would then take spun article 4 (SA4) and go to Blogger.com and create a blog around it.

I would then take the original article and upload it to EZineArticles.com and in my ‘resource box’, link back to either SA1, SA2, SA3, SA4.

I would then take spun article 5 and upload that to GoArticles.com and in my ‘resource box’, link to SA1, SA2, SA3, etc,etc. , I would also make sure my ‘resource box’ was just a little different then what I used for my ‘resource box’ in EzineArticles.com

I would then take my next spun article and upload it to say ArticleDashboard.com and in my ‘resource box’, link back to a site (SA1, SA2, SA3, SA4) that I’ve not already linked to as of yet. .

By following this practice, you stay away from creating ‘duplicate content’ as well as piggybacking off the page rank these sites have already established w/the search engines as ‘authority sites’.

Hopefully this makes sense?

The ultimate is to write different articles for different articledirectories, however, to broaden your base, you could submit the same article to multiple directories.
I would go for an inbetween solution, and write for instance 10 articles, and submit to 5 directories, giving each 2 articles.