Some webmasters have experienced that many of their pages went into supplemental results and as a result - the traffic has dropped.
Why is that happening you may ask?
Well the google has made a lot of changes in google algorithm. One is tightening Google duplicate content filters.
So first of all you must not have duplicate content on your pages. That means no copying text from other sites. You have to have a unique content.
Google has been using PageRank scores to determine whether to index a page, or should they throw it in their supplemental results pool, and perhaps how strongly they should apply various Google filters (duplicate content filters, google bombing filters).

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