I created test pages using a secret keyword and then let Google index the test pages... Then I googled the secret keyword and Google sorted the test pages.... It looks to me like one exact match in the title followed with lots of keyword stuffing in the body is what works best for content tuning currently. I did not expect the test pages to be so neatly ordered... I always figured Google worked in a lot of chaos to keep outsiders from making these kinds of determinations so easily. Cheers!