SEW Experts: It Pays to Link Consistently
By 
ArticleSnatch • May 27, 2008
You have control over the internal links on your site, so be sure you're taking advantage of that when creating them. In today's Organic Search Engine Optimization column, "It Pays to Link Consistently," Mark Jackson takes a look at ways to improve your Web site's consistency in internal linking and the use of your domain name, which can make a big difference in your site's organic search engine rankings.
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Thats right and importent what Mark write. An intern link to index.html can also produce duplicate content.
Google is able to decide beetween the index.html and the URL. Now, this makes no dublicate Content. Some Webmasters are the Opinion, that it is better for ranking to link to the index.html and to the URL.