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GoogleSharing is a system that mixes the requests of many different users together, such that Google is not capable of telling what is coming from whom. GoogleSharing aims to do a few very specific things:
1. Provide a system that will prevent Google from collecting information about you from services which don't require a login.
2. Make this system completely transparent to the user. No special websites, no change to your work flow.
3. Leave your non-Google traffic completely untouched, unredirected, and unaffected.
The GoogleSharing system consists of a custom proxy and a Firefox Addon. The proxy works by generating a pool of GoogleSharing "identities," each of which contains a cookie issued by Google and an arbitrary User-Agent for one of several popular browsers. The Firefox Addon watches for requests to Google services from your browser, and when enabled will transparently redirect all of them (except for things like Google Mail) to a GoogleSharing proxy. There your request is stripped of all identifying information and replaced with the information from a GoogleSharing identity.
This "GoogleShared" request is then forwarded on to Google, and the response is proxied back to you. Your next request will get a different identity, and the one you were using before will be assigned to someone else. By "sharing" these identities, all of our traffic gets mixed together and is very difficult to analyze.
The GoogleSharing proxy even constantly injects false but plausible search requests through all the identities.
The result is that you can transparently use Google search, images, maps, products, news, etc... without Google being able to track you by IP address, Cookie, or any other identifying HTTP headers. And only your Google traffic is redirected. Everything else from your browser goes directly to its destination.
For more information, see the webiste: http://www.googlesharing.net