Submitting articles to differnt sites

When your writing articles to submit to these articles sites can you just submit the same article to as many sites as you can find or will there be a duplicate content problem with that. Also what are like the top 10 sites to submit to, ive seen enzinearticles on here, what are some other good ones.

The following is a list of arguably the top 15 directories. A good strategy is to split your articles up. Submit half to the top 30-50 article directories for the purpose of generating incoming links. Take the other half and submit to only the top 5 "authority" directories. If you've done proper keyword research then these "authority" directories will provide you with top 10 rankings for free traffic. By splitting your articles up this way you get the best of both worlds, links and ranking. Finally, don't worry about "duplicate content." It's a misunderstood concept.

1: EzineArticles.com
2: Buzzle.com
3: ArticleDashboard.com
4: Amazines.com
5: IdeaMarketers.com
6: ArticlesBase.com
7: ArticleAlley.com
8: EasyArticles.com
9: GoArticles.com
10: ArticleCube.com
10: WebProNews.com (Internet Marketing Topics Only)
11: SearchWarp.com
12: SelfSEO.com (Webmaster related topics only)
13: AfroArticles.com
14: ArticlesFactory.com
15: ArticleBiz.com

sometimes I submit to 100 all in once with the same username. it won't get you into trouble since they all knew you were the original author all the way.

When I submit the same article to many places (let's say 40 or more sites) then I can find my article in the Article Directories in fewer places when searching for it in G0091e. However, when I take the time to spin it and make it more unique I find more backlinks to the article in more of the Article Directories in G0091e. I didn't explain it using the correct terminology but I hope you get the point.