How does using Google Web Accelerator affect my privacy?
Google Web Accelerator receives much of the same kind of information you currently send to your ISP when you surf the Web:
Google will receive your requests for unencrypted pages (those with "HTTP:", not "HTTPS:", at the beginning of the URL), along with information such as the date and time of the request, your IP address, and computer and connection information
If you enter personally identifiable information (such as an email address) onto a form on an unencrypted web page, some sites may send this information through Google. Whenever your computer sends cookies with browsing or prefetching page requests for unencrypted sites, we temporarily cache these cookies in order to improve performance
In order to speed up the display of pages generally, Google Web Accelerator may store copies of web pages, including prefetched pages that you did not visit, in the Google Web Accelerator cache on your machine. This is separate from your browser's cache, which only identifies pages that you actually visited. You can empty your Google Web Accelerator cache at any time by following these instructions.
The policies for the Google Web Accelerator, like those for Google.com, uphold the highest level of integrity and respect for our users' information. Google will never rent or sell a user's personal information to third parties without a user's explicit permission. To learn more about our privacy practices, please see the Google Web Accelerator Privacy Policy.
So, basically whatever information your ISP would receieve, Google now receieves as well.