Dont think so .Actual challenger to Google by Ex-Googlers

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actual challenger to GoogleEx-Googlers launch Cuil,I was supposed to visit cuil.com but after a long time i get
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Due to overwhelming interest, our Cuil servers are running a bit hot right now. The search engine is momentarily unavailable as we add more capacity.

Thanks for your patience.
world's "biggest search engine"
There's yet another new search engine on the block, but this time, it's being ballyhooed as an actual challenger to Google. Cuil.com (pronounced "cool") made its public launch today and already calls itself the "biggest search engine on the web." Run by a team of former Google employees, the startup takes a slightly different approach to search than most of the big names, but whether it will be able to unseat Google—or even Yahoo—remains to be seen.

Right off the bat, the Cuil team makes a number of direct comparisons to Google, but often without actually naming the Big G. For one, Cuil brags that it has already indexed 120 billion Web pages, roughly three times as many as Google and ten times as many as Microsoft. "Rather than rely on superficial popularity metrics" like Google does, Cuil's info page says that the site contextually analyzes each page and organizes search results based on content and relevance.

When you search for a particular keyword, Cuil attempts to group the results into relevant categories. As you can see from my screenshot below, searching for "chinchilla" produces tabs for "all results," "chinchilla food," "chinchilla supplies," and "chinchilla fur" across the top. An "Explore by Category" box on the right-hand side of the results page offers a number of further associations (in this case, related to the Australian town of Chinchilla in Queensland).