Index: wp-content/themes/twentyten/functions.php
===================================================================
--- wp-content/themes/twentyten/functions.php	(revision 15186)
+++ wp-content/themes/twentyten/functions.php	(working copy)
@@ -341,7 +341,7 @@
 		</div><!-- .reply -->
 	</div><!-- #comment-##  -->
 
-	<?php else : ?>
+	<?php elseif ( in_array($comment->comment_type, array('pingback', 'trackback')) ) : ?>
 	<li class="post pingback">
 		<p><?php _e( 'Pingback:', 'twentyten' ); ?> <?php comment_author_link(); ?><?php edit_comment_link( __('(Edit)', 'twentyten'), ' ' ); ?></p>
 	<?php endif;