function my_footer($thm_footertext) {
	$thm_footertext = 'Powered by <a href="http://www.wordpress.org">WordPress</a>, the<a href="http://www.themeshaper.com/thematic">Thematic Theme framework</a> and the Catmatic child theme.';
	return $thm_footertext;
}
add_filter('thematic_footertext', 'my_footer');