Who links to a site?

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http://serverfault.com – Pardon the naivety, I'm not sure how to call this but I'm also sure that its something well defined for those who are in the known. How do I find out who links to a web site? The poor man's method (and very inaccurate) is to just plug the domain name into a search engine and go through the list of results. Obviously, this is terrible, for many reasons: has to be done manually need to separate the wheat from the chaff (the latter being usually the overwhelming majority of the results) surely many links are missed this way. Now, how can this be done better? I'm thinking of some automated sy (HowTos)