Cuil—the world’s biggest search engine.

The Internet has grown exponentially in the last fifteen years but search engines have not kept up—until now. Cuil searches more pages on the Web than anyone else—three times as many as Google and ten times as many as Microsoft.
Rather than rely on superficial popularity metrics, Cuil searches for and ranks pages based on their content and relevance. When we find a page with your keywords, we stay on that page and analyze the rest of its content, its concepts, their inter-relationships and the page’s coherency.
Then we offer you helpful choices and suggestions until you find the page you want and that you know is out there. 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.
Cuil is an old Irish word for knowledge. For knowledge, ask Cuil.

Reference:http://www.cuil.com/info/

My Comment:
This is an unfamiliar search engine to me. I think, this search engine is great since the article's author said that it has wider coverage of searching capability and it has suggestions that makes the user easy to find what wants to search. And lastly, it is better because of the privacy of the search history. But, to see is to believe. I better try it and see if this search engine really is better than Google, Yahoo or Ask.com.