For the period 4/10/2011 through 5/10/2011, I've had 58% increase in Yahoo referral traffic compared to the same period in 2010. Bing is down only slightly (1.4%). Google is down 35%.
I'm only counting Google.com in this, not Google images or other services, or non-US Google queries (which aren't that significant).
If I add Yahoo and Bing together for the 2011 period, they comprise 30%.