The article linked to below describes a way for you to find out what Google has recorded about you, including that website you secretly visited that you think that know one knows about (haha). You go fear na, as you discover that as long as you use Google and its extra competent search engine, it knows so much about you, including your true location (not the one you write when you are trying to form Yankee o).
But they say the info they are collecting is just to help them serve you better (in order words, they are not going to hand it to any bad guys). Lets hope so. Meanwhile, see the link.