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Bing also has a built-in calculator, flight status, and definition queries. I'm not sure there's any data that suggests whether or not it is used more or less often from Google or Bing.

This was my first thought too, but I would guess that normal searches make up >95% of searches (averaged over the mostly non-technical population). So I don't think this can explain the discrepancy.

Could use some good data.

Also, I frequently find the information I'm looking for in the blurb from the website and so don't bother to click through. (Or I view the cached version.)

Even better, sometimes google instant answers my question before I even see search results.