From the October Google Webmaster Chat Q &A:

Anonymous: Sitemaps question: If my website has an extremely large number of pages, like, should I include every single URL that I want indexed in my XML sitemap?  If not, how should I go about populating my XML sitemap?

Wysz: Feel free to use your Sitemap to list all of your pages... that's what it's for! :) However, if you have many duplicate URLs for the same content, then you may want to only list your preferred versions of the URLs in your Sitemap.

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