I took a look at my Google analytics report under Top Traffic Sources:
(direct) ((none)) 29.16%
google (organic) 25.59%
yahoo (organic) 5.48%
facebook.com (referral) 3.72%
There's a huge discrepancy between Google and Yahoo! even though I believe Y! has by far more of my pages indexed. Does the number reflect the lower usage of Y! by users or does Google likes my optimization more?