Here’s the data (click to enlarge):
Danny Sullivan does a longish analysis of this data and trends (together with the important caveats about drawing conclusions from one month of data).
What’s interesting to me is that ACSI data, showing Yahoo! beating Google and Ask way up is supposed to be predictive of future consumer behavior and market share trends over the next 12 months:

We’ll see how accurate that turns out to be.
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Here’s Nielsen data, showing slightly different trends.
