Recommended reading by quora.com
SEOmoz - http://seomoz.com/blog/
Google Webmaster Central - http://googlewebmastercen
Matt Cutt’s Blog - http://mattcutts.com/blog
Search Engine Watch (SEW) - http://searchenginewatch.
Search Engine Land (SEL) - http://searchengineland.c
Search Engine Roundtable - http://seroundtable.com
Conversation Marketing - http://conversationmarket
David Naylor Blog - http://davidnaylor.co.uk/
Yoast Blog - http://yoast.com
Bruce Clay Inc Blog - http://bruceclay.com/blog
SEO Book - http://seobook.com/blog/
SEOmistry - http://seomistry.com/blog