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Google Webmaster Tools provides you with detailed reports about your pages' visibility on Google. To get started, simply add and verify your site and you'll start to see information right away. Learn more » https://www.google.com/webmasters/tools/home?hl=en

Webmaster Tools

Yahoo! Site Explorer

With the completion of algorithmic transition to Bing, Yahoo! Search has merged Site Explorer into Bing Webmaster Tools . Webmasters should now be using the Bing Webmaster Tools to ensure that their websites continue to get high quality organic search traffic from Bing and Yahoo!. http://l.yimg.com/pv/static/misc/index.html
http://en.wikipedia.org/wiki/HITS_algorithm

HITS algorithm

Hyperlink-Induced Topic Search (HITS) (also known as hubs and authorities ) is a link analysis algorithm that rates Web pages, developed by Jon Kleinberg .

Patent US6285999 - Method for node ranking in a linked database - Google Patents

http://www.google.com/patents/US6285999 1. A computer implemented method of scoring a plurality of linked documents, comprising:
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Google FeedBurner

https://accounts.google.com/ServiceLogin?service=feedburner&continue=http%3A%2F%2Ffeedburner.google.com%2Ffb%2Fa%2Fmyfeeds&gsessionid=z8dJAbMjlNmDpW0a7YQiFw