If you want to prevent google to provide duplicate content from you, you can easily force www for your domains by simply using a small rewrite rule for the htaccess.
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RewriteEngine on<br>RewriteCond %{HTTP_HOST} !^www.your_domain.com$<br>RewriteRule ^(.*)$ <a href="http://www.your_domain.com/$1">http://www.your_domain.com/$1</a> [R=301] |
Cheers
Alexander