yes indeed, google is very fusy about duplicated content.
You can use domain pointer for the second one going to the main one, and on and when it gets there, run a 301 moved permanently redirect script.
Not sure how good this is regarding google, but might help.
there is a script i am using to redirect 3 domain to the main one:
Code:
//check if .com and redirect to .ie
$url_string = $_SERVER['HTTP_HOST'];
if(stristr($url_string, '.com') || stristr($url_string, '.eu') || stristr($url_string, '.co.uk')) {
header("HTTP/1.1 301 Moved Permanently");
header("Location: http://www.domain.ie".$_SERVER['REQUEST_URI']);
exit();
}
//end of domain check