Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 12593)
+++ wp-admin/includes/template.php	(working copy)
@@ -1458,7 +1458,7 @@
 			}
 			if ( in_array($post->post_status, array('pending', 'draft')) ) {
 				if ( current_user_can('edit_post', $post->ID) )
-					$actions['view'] = '<a href="' . get_permalink($post->ID) . '" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $title)) . '" rel="permalink">' . __('Preview') . '</a>';
+					$actions['view'] = '<a href="' . add_query_arg( 'preview', 'true', get_permalink($post->ID) ) . '" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $title)) . '" rel="permalink">' . __('Preview') . '</a>';
 			} elseif ( 'trash' != $post->post_status ) {
 				$actions['view'] = '<a href="' . get_permalink($post->ID) . '" title="' . esc_attr(sprintf(__('View &#8220;%s&#8221;'), $title)) . '" rel="permalink">' . __('View') . '</a>';
 			}