Even from Google's own lips:
"We will share personal information with companies, organizations or individuals outside of Google if we have a good-faith belief that access, use, preservation or disclosure of the information is reasonably necessary to:
meet any applicable law, regulation, legal process or enforceable governmental request.
enforce applicable Terms of Service, including investigation of potential violations.
detect, prevent, or otherwise address fraud, security or technical issues.
protect against harm to the rights, property or safety of Google, our users or the public as required or permitted by law.
We may share aggregated, non-personally identifiable information publicly and with our partners like publishers, advertisers or connected sites. For example, we may share information publicly to show trends about the general use of our services."
From here -
http://www.google.com/intl/en/policies/privacy/
And no, they don't sell it. They give it away! Is that less evil?