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cgrantski - 12:46 am on Dec 9, 2008 (gmt 0)
Does knowing that help make it easier to do? You still can block everything from getting into your site. You just have to allow requests to go out from the site, to the outside world.
For Google Analytics, it's not Google seeing into your site. It's requests from your site going out to Google Analytics, any time a user triggers the Google Analytics javascript.