Already have I think - there are a few books/sites which describe search engine theory but you might also want to look into data mining techniques and you'll certainly need to get up to speed on regular expressions.
Cassie - it doesn't have to be complicated for your site - don't Google do a sort of mini search engine that you can add to your own site?
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homo sum: humani nil a me alienum puto ... ( just Google it )
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