I am using thesis developer version to redesign the site [FFXIV Gil](http://www.cheapffxivgils.com/ "Cheap FFXIV GIL").
Before using the code, you should add the Unique Hook Name to BOX in template(see [the official tutorial](http://diythemes.com/thesis/rtfm/add-custom-php-functions/ "official tutorial")). In my case, I am using the name 'footer_copy'.

<?php
function copyright() { 
   $url = site_url();
   $anchor = get_bloginfo( 'description' );
   echo '<p>Copyright &copy; 2010&ndash;' . date('Y').'&nbsp;<a href="'.$url.'">'.$anchor.'</a></p>';
}
add_action('thesis_hook_container_footer_copy_bottom', 'copyright');