Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 15490)
+++ wp-admin/includes/media.php	(working copy)
@@ -1910,6 +1910,7 @@
 
 	$type_links[] = "<li><a href='" . esc_url(add_query_arg(array('post_mime_type'=>$mime_type, 'paged'=>false))) . "'$class>" . sprintf(_n($label[2][0], $label[2][1], $num_posts[$mime_type]), "<span id='$mime_type-counter'>" . number_format_i18n( $num_posts[$mime_type] ) . '</span>') . '</a>';
 }
+$type_links = apply_filters('mime_type_links', $type_links); 
 echo implode(' | </li>', $type_links) . '</li>';
 unset($type_links);
 ?>