Common Causes of Supplemental Pages:

• Pages due to canonicalization problems, e.g duplicated content, too much content similarity;
• Pages with low or no content;
• Orphaned web pages. Pages that no one links to, including your own;
• Error pages, if a site does not use If-Modified-Since, Last Modified and/or Expires rules;
• Poor website navigation;
• Loading pages with irrelevant keywords (keyword stuffing);
• Too low PageRank;
• Long URLs, especially with long parameters, starting with a question mark (?) and being separated with an ampersand (&) and are not rewriten;
• Suspicious pages for spamindexing, like non-unique and irrelevant to page content heading tags, meta tags, or linking to bad neighborhoods, etc.

So do you want to say here that linking to supplemental pages is the best solution? If the pages have too low PageRank I could understand and would agree, if they are important pages though. But what if the problem is one of the other cases?

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