The Golfweek/Sagarin Performance Index just put Cristie Kerr at #1, barely ahead of Lorena Ochoa and Paula Creamer. I think that Kerr's record over the previous 52 weeks justifies this ranking. What about you?
[Update 1 (8/21/09, 5:30 pm): Heh, I beat Golf Babes to the punch by a few days. But guess who will get more page views? Hint: it's the blog with the visuals.]