Index: wp-admin/includes/comment.php
===================================================================
--- wp-admin/includes/comment.php	(revision 7760)
+++ wp-admin/includes/comment.php	(working copy)
@@ -66,9 +66,28 @@
 
 function get_pending_comments_num( $post_id ) {
 	global $wpdb;
-	$post_id = (int) $post_id;
-	$pending = $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '0'", $post_id) );
-	return $pending;
+
+	$single = false;
+	if ( !is_array($post_id) ) {
+		$post_id = (array) $post_id;
+		$single = true;
+	}
+	$post_id = array_map('intval', $post_id);
+	$post_id = "'" . implode("', '", $post_id) . "'";
+
+	$pending = $wpdb->get_results( "SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN ( $post_id ) AND comment_approved = '0' GROUP BY comment_post_ID", ARRAY_N );
+
+	if ( empty($pending) )
+		return 0;
+
+	if ( $single )
+		return $pending[0][1];
+
+	$pending_keyed = array();
+	foreach ( $pending as $pend )
+		$pending_keyed[$pend[0]] = $pend[1];
+
+	return $pending_keyed;
 }
 
 // Add avatars to relevant places in admin, or try to
Index: wp-admin/edit-post-rows.php
===================================================================
--- wp-admin/edit-post-rows.php	(revision 7760)
+++ wp-admin/edit-post-rows.php	(working copy)
@@ -22,6 +22,14 @@
 if ( have_posts() ) {
 $bgcolor = '';
 add_filter('the_title','wp_specialchars');
+
+// Create array of post IDs.
+$post_ids = array();
+foreach ( $wp_query->posts as $a_post )
+	$post_ids[] = $a_post->ID;
+
+$comment_pending_count = get_pending_comments_num($post_ids);
+
 while (have_posts()) : the_post();
 $class = 'alternate' == $class ? '' : 'alternate';
 global $current_user;
@@ -113,7 +121,7 @@
 		?>
 		<td class="num"><div class="post-com-count-wrapper">
 		<?php
-		$left = get_pending_comments_num( $post->ID );
+		$left = isset($comment_pending_count) ? $comment_pending_count[$post->ID] : 0;
 		$pending_phrase = sprintf( __('%s pending'), number_format( $left ) );
 		if ( $left )
 			echo '<strong>';