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A free, very useful, service from Google. Ignore the 'webmaster' tag - anyone who has an interest in driving qualified organic traffic to their website should be using this. The presented data is different from that found within Google Analytics, which is all about human traffic; the Webmaster Tools present information concerning a website from the search engine (or web crawler) perspective. Website analysis covers diagnostics, statistics, links and site map reports.
Visit the official Google Webmaster Central Blog.