To have or not to have privacy

As you might know by now, Google’s ill-timed announcement for its free GMail service which includes a whopping 1 GB mailbox, and advanced search techniques to sort the mail for you, is no joke. It’s very real, though still in beta testing. But now that the idea has sunk in, another matter pops up…privacy.
To generate the money to sustain the service, relevant advertisement is being used. As everybody knows, my most passionate subject is….golf. Therefore, most of my e-mails will reflect that and hence when I use GMail daily, I will come across ads for a new Tiger Woods PC game, or a new vendor selling high quality Iron 5’s through 9’s.
Is this privacy invasion or not ? Will you sign up when it becomes available or not ? Oh, and while you’re at it, guess if I will sign up or not, because I’ve already decided.