Google has actually talked about testing results with more than 10 search results:<p>"So, Marissa (Myer, Google VP) ran an experiment where Google increased the number of search results to thirty. Traffic and revenue from Google searchers in the experimental group dropped by 20%.<p>Ouch. Why? Why, when users had asked for this, did they seem to hate it?<p>After a bit of looking, Marissa explained that they found an uncontrolled variable. The page with 10 results took .4 seconds to generate. The page with 30 results took .9 seconds."<p><a href="http://glinden.blogspot.com/2006/11/marissa-mayer-at-web-20.html" rel="nofollow">http://glinden.blogspot.com/2006/11/marissa-mayer-at-web-20....</a>