A bunch of Ex-Googlers have launched what is being presented as the Yet Another Google Killer and has already indexed more than 121 billion web pages, one eighth of the estimated one trillion URLs Google has identified until now.
By pure coincidence (or sheer marketing tactics), Google announced its trillionth page indexed on the 25th of July, just as news of Cuil unofficial launch trickled on the net; hence Cuil still shows old metrics, putting Google's indexed page reserves at 41 billion pages and Microsoft's search engine at merely 12 billion.
Unlike Google's Pagerank technology which evaluates a page's pertinence mainly by the number of inbound links, Cuil "searches for and ranks pages based on their content and relevance" and "stay on that page and analyze the rest of its content, its concepts, their inter-relationships and the page’s coherency".
A quick search for Google on Google provides with 2.5 billion results while Cuil retrieved 172 million matches and provides you with the ability to explore the results by category, something Google has yet to introduce.
But according to some early testers, Cuil spiders have yet to be fine tuned as the index seems to contain a number of error pages and could easily be gamed by potential scammers and cybercriminals.
Cuil (pronounced Cool) has been created by former Google employee Anna Patterson, with her husband, Tom Costello, a Search Engine expert who worked previously at Stanford University and IBM and Russell Power, also a former Google Employee who worked on various Search Engine Algorithms.
Cuil is an old Irish word for knowledge. Interestingly, Google launched a new service last week, Knol, which, the search engine posits, is a unit of knowledge.
Ironically, Cuil could be a rather interesting acquisition target for the likes of Microsoft or even Google who may wish to quash a potential competitor.