To be honest, I havent done much math on it.
However I can say that since I installed it (about 8 weeks ago) I have had at least 5 and upward of 50 instances of Yahoos slurp on there CONSTANTLY. I mean every single minute of the day.
Google is another story. He hasnt really been by so much so I cant say he likes it better or worse.
Apart from those, MSNs on a lot more, and Jeeves is too.
My main focus is google though and like I said I cant provide figures either way. However it is making some difference