google webmaster tools
Google Webmaster Tools is a free-to-use web service by Google, allowing webmasters to check the indexing status and optimize visibility of their websites.
Google Webmaster Tools enables webmasters to:
- Submit and check a sitemap
- Check and set the crawl rate, and view statistics about how Googlebot accesses a particular site
- Generate and check a robots.txt file
- List internal and external pages that link to the site
- See what keyword searches on Google led to the site being listed in the SERPs, and the click through rates of such listings
- View statistics about how Google indexes the site, and if it found any errors while doing it
- Set a preferred domain which determines how the site url is displayed in SERPs
Read more and access this at http://www.google.com/webmasters/tools/
Updated January 2010