I was on the phone with Microsoft and they presented a statistic in the context of our discussion about Bing and mobile: 53% of mobile searches on Bing have a local intent. I stopped and verified the number and its source.
Google has said the number is about 33%, but this number isn't based on internal Google data. It repeats a BIA/Kelsey survey figure or estimate. I have suggested to Google that it put out a number based on what it observes in its own query logs. Google has said that 20% of PC based search queries have to do with location.
The Microsoft data, I confirmed, are drawn from internal query log analysis. This is a big deal and a real number based on search user behavior.