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Great site all-around. Incredibly useful... The few ads, completely unobtrusive, it has are readily blocked by firefox's adblock programs. Anyone who thinks that google is spying on you is rather uninformed:
1) Google clearly states in their EULA's that all information gathered is used explicitly for the bettering of their services. (In a manner that is essentially the same as WOT's own liscense agreement, so anyone crying out the contrary should either go take a look at the EULA's for themselves or leave WOT if they are really that paranoid. Might as well slap on a tin hat as they go out the door.
2) Google allows people to brows anonymously/delete search history anyways, making this a moot point to begin with. Of course, you can simply browse without even logging on.