Submitting articles to quality article directories can help secure free backlinks to your website. In addition to that they also help improve your reputation and trust factor. But here are a few points to bear in mind:
1.) Don't submit the same article to multiple directories: Links from duplicate articles do not carry the same value as links from original articles. So avoid submitting the same article to multiple directories.
2.) Submit to good quality directories: There are thousands of article directories over the internet but not all are of good quality. Securing links from low quality directories can do more harm than good. Make a list of the best directories on the net and submit articles to them on a regular basis. A good directory is one that has a lot of backlinks, have a good PR (Above PR4) and is aged.
3.) Submit to directories that allow intext links: Submit your article to directories that allow you to paste a link right within the article text. This looks more natural than a link from the article signature and will fetch you more value.
4.) Avoid nofollow directories: Some highly popular directories like articlebase.com add a nofollow to your links. This means you will not benefit from the SEO point of view. A nofollow tells Google and other search engine bots not to crawl the link or pass any value.
Finally, here are some good quality article directories to consider:
www.Outofstress.com - PR5 general directory. Allows links within the article text
www.Selfgrowth.com - PR6 directory focused on health. Links allowed only from signature. Links within content are nofollowed.
www.Sooperarticles.com - PR5 general directory. Links allowed only from signature.
www.Goarticles.com - PR5 general directory. Links allowed only from signature.