Every day there are more than a billion searches on Google

"Google has already gone live with a dedicated promotion website to tout enhanced search ads, and published a series of videos that should help advertisers understand what they’re all about.
They also talk numbers, such as:
- Every day there are more than a billion searches on Google. (source: Google)
- Since 2003, Google has answered 450 billion new unique queries. (source: Google)
- The +1 button is being served 2.3 billion times a day all over the web. (source: Google)
- The average query response time is roughly a quarter of a second. (source: Google)
- More than 20% of searches on Google on a desktop are related to location. On mobile, it‘s about 40%. (source: Google)
- People drive more than 12 billion miles a year with Google Maps Navigation. (source: Google)
And:
- Every query has to travel on average 1,500 miles to get back to the user. (source: Google)
- More than half our searches come from outside the U.S. (source: Google)
- We’ve never seen 16% of the queries we see every day. (source: Google)"

Source:  Data from Google's 'Answers' site, republished by TechCrunch, 3rd October 2011

Here is the Google Answers 'Numbers' page