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Read Bruce clay's blog at http://www.bruceclay.com/in/seo/search-engine-optimization.htm, you can also follow search engine land, search engine watch, inbound.org to further sharpen you skill.
There are lot of seo books available in market too. You can find them at amazon by doing search...
I usually use SEO Dubai company website to search usefull info.
I have found interesting article – How to choose the right SEO company in Dubai.
