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Hi,

Have you have you had a look at the Yoast magento canonical plugin . Also he has a good article on general magento optimisation. Have to admit these might be a bit dated I just remembered them from when I was doing some stuff with magento a while back. Hope it helps as a starting point though.

Whats in your .htaccess file at the moment?

I think in your .htaccess your redirect should be setup something along the lines of:

RewriteCond %{HTTP_HOST} ^www.old-domain.com$ [NC]

RewriteRule ^(.*)$ http://new-domain.com/$1 [R=301,L]

Someone else could probably make that a bit neater but something like this should work.