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By Patrick Marshall Just because you're paranoid doesn't mean you're not being watched. When you're on the Internet, there are good reasons to have that eerie sense of being followed. By now, most of us know that websites can gather a surprising amount of information about your computer. For example, the page request you send to a site's server includes detailed information about your browser — not just which browser you're using, but the exact version, its configuration, and even the screen resolution the browser is running in. Other gathered data includes the page you came from, what document you're requesting, and — yes, your IP address. And don't think you have anonymity just because your service provider gives you a dynamic IP address. At a minimum, visited websites can tell what service provider you're with and what city or region you are in. What's more, any communication with a Web server gives it the opportunity to deposit a...