You could try editing line 156 of _item_feedback.inc.php

$CommentList = & new CommentList( NULL, implode(',', $type_list), array('published'), $Item->ID, '', 'ASC' );

and change 'ASC' to 'DESC'

I havn't done this but it just might work. :)

_item_feedback.inc.php file is in the skins folder.

Thanks, it works!