Some very usefull tools that Google Webmasters is offering us :Statistics, diagnostics and management of Google’s indexing of your website, including Sitemap submission and reporting, Finding out whether your site is currently being indexed by Google, Google Analytics shows you which sites, search engines, and keywords refer your traffic and how visitors interact with your site, Learn how to easily submit all types of online and offline content on Google through Google Base, Google Book Search, and other services.

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http://www.google.com/webmasters/