I found this article useful, so blogged here !

One of the most common questions I see about Google is “How do I clear my search history from the Google search box?” What’s everybody guilty of ? If you’re one of the many it seems that have search terms you’d prefer to hide from other users of your computer, this article is for you.

When you key into either the Google home page search box, the Google Toolbar search box or the Firefox Googlebar extension, the the search terms you keyed are stored unless disabled. Then, on subsequent uses of the search box, it suggests what it is you might want to search for by showing a drop down list filled with previously keyed search terms whose initial characters match what you are keying. For example, if you in the past searched for “hot pictures” (PG version) and your spouse, kids or boss sit down and start to key in “hot tamales,” the words “hot pictures” will be in the drop down box as a suggestion for them. If this situation doesn’t thrill you, you need to tell the browser, and Google Toolbar or Firefox Googlebar to cut it out!

Complete Article : Click Here

And the link Google Tutor is quiet cool site to know the way you wanna use google around and specially if you are new to Google (probably no one is ) !