Questions
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WWW vs Non-WWW/Moving a site to a new CMS/Redirect all of the previous URLs
A very late answer to the question, but you want to put in the 301 (permanent) redirects as soon as you know of a problem. http://www.seomoz.org/blog/duplicate-content-in-a-post-panda-world has some great help regarding duplicate content.
Intermediate & Advanced SEO | | KeriMorgret0