Considering Google gets 140+ million unique visitors, that's less than 0.0064% of all users? Color me unimpressed. Now if you told me personal information was being offered WITHOUT a court order, then I'd be more concerned.
You can find out more information here: http://www.google.com/transparencyreport/governmentrequests/ and the blog post we did about the subject is here: http://googleblog.blogspot.com/2010/04/greater-transparency-...
So me searching for "how much antifreeze..." wouldn't ever be noticed, unless i was _already_ under suspicion that met legal standards for a warrant, so that search data was requested.