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Conversion rate is the only test, and only thing I care about as far as any SE producing relevant results is concerned.
Yahoo now has the highest conversion rate, with MSN a tad behind and Google coming in behind AOL, AJ, AV and ATW percentage wise (Google volume is high, it just doesn't convert well in % terms).
ConRate has picked up a tad since Brandy......G seems to be realizing it made a mistake and Y has proven it can take back the lions share!