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Wordtracker provides search number data for google, as well as other engines. I've never found it to be that accurate, but it's still usefull for comparative purposes. Do you target "amateur sex" or "amateur porn", that kind of stuff.
PPC engines have a vested interest in screwing around with the search numbers, but as long as they do it across the board ("hey guys, the payment on my Ferrari is due, double the search numbers for a month"), then they're still somewhat usefull.
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