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they could always compare the :) and :( with pagerank....and on scale, it might point out that PR is not reflecting the results that the average visitor wants
my 0.02 anyway, google cant rely solely on pagerank all its life - and lately seems to have had its ears wide open in regards to what the public wants in a SE
At any rate, right now it does nothing but send your search phrase, the URL and your vote to Google, but they're doing nothing with it at this time.