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I just tried it and each search I tried it just repeated its logo and search boxes all over the page which was very strange and not a single result.
What do you think does an engine like Vivisimo pose any threat to Google?
I wonder whether Google will now start looking at this, (is they were not already) - it makes sense helps people conduct searches and Google may well be able to do it without the need to look at other engines it could do it all through its own algo's and results.
Even with this we have never seen a referral in our logs from them. They may eventually make an impact but like the others in the field they have a lot of filtering to do.