Index: wp-admin/includes/upgrade.php
===================================================================
--- wp-admin/includes/upgrade.php	(revision 16465)
+++ wp-admin/includes/upgrade.php	(working copy)
@@ -182,6 +182,8 @@
 								'link_rss' => '',
 								'link_notes' =>'');
 
+	apply_filters( 'wp_install_default_links', $default_links );
+
 	foreach ( $default_links as $link ) {
 		$wpdb->insert( $wpdb->links, $link);
 		$wpdb->insert( $wpdb->term_relationships, array('term_taxonomy_id' => $blogroll_tt_id, 'object_id' => $wpdb->insert_id) );