Which blog do you follow or subscribed to know about Google's update? I follow a lot of official Google resources to be updated with any update by search engine giants. I subscribed these blogs and resources: http://googlewebmastercentral.blogspot.com/ http://googleblog.blogspot.com/ http://analytics.blogspot.com/ http://googleindia.blogspot.com/ https://twitter.com/#!/GOOGLE http://www.mattcutts.com/blog/ Do you know any other resource by Google which I missed?
Other big SEO sites like SEOMoz has good discussions and topics on expert's view about Google changes so they are good site to follow too.
i am following 2 blogs of this this. and on blog you have forget to listed which is google adsense blog ,first i am follwing blog is googleblog and second is a google adsense blog it's to helpfull to get latest updates ....