We'll create fresh WordPress site with rel=”external” in a New Window installed. You have 20 minutes to test the plugin after that site we'll be deleted.
rel=”external” is now the XHTML valid version that informs search engine spiders that the link is external. However, using this does not open the link in a new window. target=”_blank” and target=”_new” does this, but is not XHTML valid.
This very simple plugin adds a small JS file to your header to let this happen!