I have a domain, www.timeclockmtsonline that I have 301'd to www.timeclockmts-online.com using the following PHP:
<?php header( "HTTP/1.1 301 Moved Permanently" ); header( "Location: http://www.timeclockmts-online.com" ); ?>
However, when I do a google search on with www.timeclockmtsonline.com as the search term I can see a listing for that domain. I thought I'd see nothing. Now I am worried about being hit with a duplicate content penalty.