GoogleGuy explains that the Google Toolbar FAQ discloses the fact that it automatically updates.
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Net_Wizard, I thought we did a pretty good job of letting users know about the auto-update by putting it in the FAQ. I'll pass on the feedback that you think it should be more visible. In general, we only want users to install the toolbar if we have their fully informed consent. I'll mention that someone here thought that discussing it in the Frequently Asked Questions wasn't clear enough.
piniyinipompom, if using the toolbar makes you uncomfortable in any way, I'd read through all the documentation--we do our best to make the toolbar useful, and to disclose exactly what it does and doesn't do. If you enjoyed reading Google Watch, I think the same author has written a really interesting article about mind control too. If you do a search for "mind control and the secret state" it should show up. I'd never heard of technologies like radio hypnotic intra-cerebral control and hypnotic dissolution of memory; it's a good read--I enjoyed it a lot.