WAS
 if ( $keys = get_post_custom_keys() ) {
                echo "<ul class='post-meta'>\n";
                foreach ( $keys as $key ) {
                        $keyt = trim($key);
                        if ( '_' == $keyt{0} )
                                continue;
                        $values = array_map('trim', get_post_custom_values($key));
                        $value = implode($values,', ');
                        echo apply_filters('the_meta_key', "<li><span class='post-meta-key'>$key:</span> $value</li>\n", $key, $value$
                }
                echo "</ul>\n";

NOW

if ( $keys = get_post_custom_keys() ) {
		foreach ( $keys as $key ) {
			$keyt = trim($key);
			if ( '_' == $keyt{0} )
				continue;
			echo "<ul class='post-meta'>\n";
			$values = array_map('trim', get_post_custom_values($key));
			$value = implode($values,', ');
			echo "<li><span class='post-meta-key'>$key:</span> $value</li>\n";
			echo "</ul>\n";
}