use Google webmaster tools and set your preferred domain in there, also do a 301 redirect to the preferred domain.
you have different PR as it's seen as 2 different pages, it's also classed as duplicate content. Do as RobertD has suggested to fix your problem.
If you dont do anything about it Google will eventually find out that it is the same domain. But the best thing is to have a routine on all your new sites to place a .htaccess file that redirects all non www to www. Its very easy, just putthis in your .htaccess file: RewriteEngine on RewriteCond %{HTTP_HOST} ^domain\.info RewriteRule ^(.*)$ http://www.domain.info/$1 [R=permanent,L]
<IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteCond %{HTTP_HOST} ^domain\.info RewriteRule ^(.*)$ http://www.domain.info/$1 [R=permanent,L] </IfModule> I had to add these extra lines to make it work on mine