Just to make one point, as I have developed an auto suggest feature in the past, identical (or nearly identical) to the service that Chrome communicates with.

This auto suggest feature is identical to the functionality of the search box in Mozilla Firefox and is under consideration for use in Internet Explorer, except in Chrome it uses the address bar instead of a seperate search pane. If you set a different search engine from Google, this information is sent to that other search engine, who I am sure will track the information as well. This transmission of data can also be disabled in Chrome. It can not be disabled in Firefox.

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The best way to learn anything, is to question everything.