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I'm looking for a way to find out what keywords/keyphrases are being used on all search engines for my website. My stats program shows a few but there must be loads that I haven't found yet. Thanks for reading.
I'm building a small keyword-relevancy search engine. I'd like to move beyond simply keeping track of what words are in what documents -- at least, I assume there's a beyond having to do with keyword density and such. What should I read to find out more? Are the open source projects I should check out?