Index: wp-admin/edit-attachment-rows.php
===================================================================
--- wp-admin/edit-attachment-rows.php	(revision 7465)
+++ wp-admin/edit-attachment-rows.php	(working copy)
@@ -43,7 +43,7 @@
 
 	case 'icon':
 		?>
-		<td class="media-icon"><?php echo wp_get_attachment_link($post->ID, array(60, 40), false, true); ?></td>
+		<td class="media-icon"><?php echo wp_get_attachment_link($post->ID, array(80, 60), false, true); ?></td>
 		<?php
 		// TODO
 		break;
Index: wp-admin/wp-admin.css
===================================================================
--- wp-admin/wp-admin.css	(revision 7465)
+++ wp-admin/wp-admin.css	(working copy)
@@ -502,8 +502,8 @@
 }
 
 td.media-icon img {
-	max-width: 60px;
-	max-height: 40px;
+	max-width: 80px;
+	max-height: 60px;
 }
 
 #update-nag, .plugin-update {