Separete trackbacks/pings and numbered comments

For numbering, in your comment.php, change this:

wp_list_comments('callback=mytheme_comment');

To this:

wp_list_comments(array(
  'callback'=>'mytheme_comment',
  'style'=>'ol',
));

For separation into comments and pingbacks, you’d do something like this:

wp_list_comments(array(
  'callback'=>'mytheme_comment',
  'style'=>'ol',
  'type'=>'comment',
));

wp_list_comments(array(
  'callback'=>'mytheme_comment',
  'style'=>'ol',
  'type'=>'pings',
));