Better subscribe to google's own blog. They provide you the detail analysis report when ever they make a update or introduce a new one.
http://googleblog.blogspot.com/
http://analytics.blogspot.com/
http://googlewebmastercentral.blogspot.com/
http://adwords.blogspot.com/
http://adsense.blogspot.com/
Other than this i strongly suggest you to read articles from
http://searchengineland.com/
http://www.searchenginejournal.com/
>> Here you can find excellent articles from the industry's top notch professionals.
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