Google search history and privacy

Following on from my Machine is Using Us post here is an informative essay on Google's tracking of your searches. I dont know if this happens with all users, but as I also have a Gmail account, Im getting well tracked.
I'm not to sure how I feel about this. On the one hand, yes, its usefull to go back to something I was searching for last year, on the other, with so much stuff that Google offers now, hacking a Google account would bring a wealth of information on the target.

[Link]