One of the most interesting snippets from this official Google blog page.
Quote:
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Link evaluation. We often use characteristics of links to help us figure out the topic of a linked page. We have changed the way in which we evaluate links; in particular, we are turning off a method of link analysis that we used for several years. We often rearchitect or turn off parts of our scoring in order to keep our system maintainable, clean and understandable.
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http://insidesearch.blogspot.com.au/...0-changes.html