Sigh.
Google's opt-out doesn't opt you out of
all of the information it sends,
only some of it. It does aggregate your Google and computer usage, and sends that back for analysis with their internal tools, and shares that aggregated info with their customers and partners.
"Once the Google search technology is installed for free on a personal computer, it will transmit basic data daily about usage patterns. For example, it will tell the company how often Google is being used to search personal computers, how often it is used to search the Web, and how often simultaneous searches are done. Google lets users opt out of sending some usage data, but not all of it.
However, Mayer said the data collected will be aggregated so that the company knows where to focus its efforts on upgrading the search technology. She emphasized that the daily up-loading will not transmit any personal information to Google and said it is typical for major software programs that offer voluntary upgrades and fixes for bugs to capture that sort of information as a matter of routine."