Diberry, Google uses ALL available methods of recording data and saves it all, permanently. Some services, like GWT as tedster points out, are beneficial (for now). However, GWT requires you to log in and when you do you provide your current IP that is matched against all of the beacons you were recorded by while online, and
some of those methods you'd never realize are there.
example: Do you have firefox? If so, have you bookmarked ANY Google service (search, adsense, gmail etc)? I'm not talking about the google toolbar here though it records too, I mean actual bookmarks.
If so the bookmark loads the Google favicon from a Google server for every page you visit online thus giving Google a complete map with datestamps of every url you visited(IP+URL+Datestamp+who knows what else).
Mozilla is aware of the loading of favicons as some have complained they take too much room. The solution posted on the Mozilla site suggests a css method of removing them however that method does not stop them from being called. There is currently no solution provided by Mozilla to stop this. (edit: besides suggesting you delete bookmarks?!?)
Solution: Add your Google links to a redirect page and host it on your own server and then bookmark your own server. That way firefox will attempt to load the favicon from YOUR server, at least for now until someone makes firefox follow the redirect. This isn't a Google only issue, it's a potential problem with every site you have bookmarked.
Bonus: This solution lets you turn the tables on data gatherers because you have access to your server records to see who is trying to gather data from your bookmarks.
Citation: The Mozilla site has a page detailing active ways in which your browser may be contacting other sites on the web and on their list it mentions bookmarks being reloaded per page load, including favicon hosted directly from its source. (live bookmarks updating)
Useful official link on
How to stop Firefox from automatically making connections without my permission which mentions the live bookmark updating described above and more: [
support.mozilla.org...]