Ah the small print --- from google's privacy policy.
Quote:
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Google collects limited non-personally identifying information your browser makes available whenever you visit a website. This log information includes your Internet Protocol address, browser type, browser language, the date and time of your query and one or more cookies that may uniquely identify your browser.
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The problem is that this information, when correlated with information from web sites you're using such as user names, passwords, etc. (all of which would be routed through their proxy and caches except for https information which goes through the proxy but not the caches), can tell them, or anyone else who has access, exactly who you are, where you surf and what you do.