There are a lot of article directories available in internet but it is very hard to find auto approve article directories. Here is a list of auto approve article directories-
http://www.articledirectoryproject.com/ 3
http://articlemonkeys.com/ 3
http://goarticles.com/ 3
http://ideamarketers.com/ 5
http://www.articlewarehouse.com/ 3
http://www.articleoutpost.com/ 3
http://www.upublish.info/ 4
http://www.sooperarticles.com 5
http://www.amazines.com/ 3
http://www.articlesshare.com/ 3

You can use those to get instant backlinks. I will get back with some more.

Thank you for sharing the list with us.
We will be looking forward the next list.

Great sites for the article submission easily,.
Many others also looking for such sites thanks for the sharing ,.