John Scott
Creator of the PR8 sites, Bluefind Directory and the v7n webmaster community says:

Link building is indeed the way to top rankings. Getting links with the right anchor text is the key to SEO. But - here's the secret - it's not the number of links per se, but the number of unique domains and IP's that are linking to you.

   
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 Specialists Agree

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Directories are NOT 
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    Share of Searches: March 2005
The chart below shows the percentage of online searches done by US home and work web surfers in March 2005 that were performed at a particular search engine. Internal site searches, such as those to find material within a particular web site, are not counted in these totals. The activity at more than 60 search sites makes up the total search volume upon which percentages are based.
    
     
Note that the figures are search-specific but probably not necessarily web-search specific.  Also note that some companies own more than one search site. This means searches at different sites may be combined into one overall figure for the company's entire network. Remember, in all cases, only activity by those in the US is measured, even if those in the US go to a site run by a company outside the US, such as Google UK.
  
Source: Nielsen NetRatings Search Engine Ratings by Danny Sullivan