randle - 2:08 pm on May 10, 2010 (gmt 0)
The last week was the biggest single change in our referral profile graph since florida 2004.
Well its going to take a bit of time to study impression and click through rate numbers to prove guilt. But, if your experiencing the biggest single change in referrals right on the heels of the biggest one time change in the Google results layout functionality, you have a pretty good suspect.
This injection of search functionality on the left hand side is a monumental change, a bit surprised theirs not more discussion on it.