Google know all about your search habits and constantly gathers data about you from your searches. If you are concerned about Googles domination of Internet search or the fact that they track everything you search for. You might like to try cuil and new search engine by former Google staff.
Cuil searches more pages on the Web than anyone else—three times as many as Google and ten times as many as Microsoft.
Here's what Cuil has to say about privacy, "We believe that analyzing the Web rather than our users is a more useful approach, so we don’t collect data about you and your habits, lest we are tempted to peek. With Cuil, your search history is always private." To find out more about Cuil go here