Every other search engine is a different result.

Do you use only one search engine? Think every new
will the system give you similar results? You do not even imagine how
you are mistaken. After the introduction of one word-question popular search
systems give search results that match only ... by one percent!

“Every other search engine is a different result,” is the result.
research companies Dogpile and Infospace. American informatics
compared among themselves four popular search engines: Google, Yahoo,
Windows Live, Search and Ask.

It turned out that after the introduction of the question appearing on the first page
results coincided only in ... 0.6% of cases, 2.2% of results
repeated in three search engines, and 8.9% - in two.
')
Most importantly, 88.3% of the results were unique to only one
search engine! And that means, relying on results only
one search engine, we see the world of the Internet through her eyes.

Also the subject of research was which of the search engines most
"Subjective." Windows Live wins in this category - 80.1% of the results
are unique only to her. This is followed by: Yahoo (79.4%) and Ask
(75%). The most "objective" is the Google search engine - only, and
may as much as 69.8% of its search results do not match the search results
in other systems.

Source: http://www.uk2watch.com/culture/article.jsp?12491