Cuil, a new search engine, opened for business on Monday, boasting an index of 120 billion Web pages, "three times more than any other search engine."

For Cuil, pronounced "Cool" rather than "Quill," there's a separation between search and surveillance. Whereas Google records information about its users and their searches to improve the user experience and to deliver more relevant search results and ads, Cuil remembers nothing.

Cuil's privacy policy actually promises privacy: "When you search with Cuil, we do not collect any personally identifiable information, period. We have no idea who sends queries: not by name, not by IP address, and not by cookies (more on this later). Your search history is your business, not ours."