Most wordpress themes out there (by default) combine both comments and trackbacks / pingbacks together and display under the same list. But why bother separating them? Simply to make things looks more organize so your blog commenters have a clearer picture what are the comments, what’s not. Doing it is not hard, but you need toe be using independent WordPress blog (not the wordpress.com), provided with access to change comments.php. Prepare your favorite editor, and here we go.