I think article submission are depended on the our keyword and relevance article is very useful to get more traffic and visitor read after he think about the our click so we get visitor using by best relevance article contain.
Article submission will be good for the web promotion and need to avoid duplicate content and Article submission is a good way of expose about the services or looking fo back links.
As of me, Article marketing is the best free advertising even if a paid submission service is used.It certainly save time in getting back-links to your website instead of directory submission and link exchanging.
Article submission really gives good boost to our keyword. But keep only one thing in mind that article you are submitting should be really unique and has some quality content. Do not stuff keywords in it.
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The best way to promote your article is to get in link with the good article directory services n join them, after u became a member write or post ur articles but it should be very good and unique.
When you work on the article submission you should put in your mind that it serve for the long term, so you have to use it as a long term strategy. so you have to work on it parallel with other SEO Link building ways.
Most important tip is
Make sure to properly check the guidelines of various article directories - some directories will strip out HTML and some don't. Make sure you take proper care of that in order to obtain maximum links with good anchor texts.