Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.799
diff -u -F^f -p -r1.799 common.inc
--- includes/common.inc	20 Sep 2008 20:22:23 -0000	1.799
+++ includes/common.inc	23 Sep 2008 21:13:26 -0000
@@ -3293,8 +3293,6 @@ function drupal_write_record($table, &$o
     // Track serial fields so we can helpfully populate them after the query.
     if ($info['type'] == 'serial') {
       $serials[] = $field;
-      // Ignore values for serials when inserting data. Unsupported.
-      unset($object->$field);
     }
 
     // Build arrays for the fields, placeholders, and values in our query.
Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.977
diff -u -F^f -p -r1.977 node.module
--- modules/node/node.module	17 Sep 2008 20:37:32 -0000	1.977
+++ modules/node/node.module	23 Sep 2008 21:13:26 -0000
@@ -887,20 +887,23 @@ function node_submit($node) {
 }
 
 /**
- * Save a node object into the database.
+ * Save changes to a node or add a new node.
+ *
+ * @param $node
+ *   The $node object to be saved. If $node->nid is
+ *   omitted, a new node will be added (unless $node->is_new is FALSE).
  */
 function node_save(&$node) {
   // Let modules modify the node before it is saved to the database.
   node_invoke_nodeapi($node, 'presave');
   global $user;
 
-  $node->is_new = FALSE;
+  if (!isset($node->is_new)) {
+    $node->is_new = empty($node->nid); 
+  }
 
   // Apply filters to some default node fields:
-  if (empty($node->nid)) {
-    // Insert a new node.
-    $node->is_new = TRUE;
-
+  if ($node->is_new) {
     // When inserting a node, $node->log must be set because
     // {node_revisions}.log does not (and cannot) have a default
     // value.  If the user does not have permission to create
@@ -922,6 +925,7 @@ function node_save(&$node) {
   }
   elseif (!empty($node->revision)) {
     $node->old_vid = $node->vid;
+    unset($node->vid);
   }
   else {
     // When updating a node, avoid clobberring an existing log entry with an empty one.
@@ -967,9 +971,12 @@ function node_save(&$node) {
   // node_invoke($node, 'update').
   node_invoke($node, $op);
   node_invoke_nodeapi($node, $op);
-
+  
   // Update the node access table for this node.
   node_access_acquire_grants($node);
+  
+  // Clear internal properties.
+  unset($node->is_new);
 
   // Clear the page and block caches.
   cache_clear_all();
@@ -978,7 +985,7 @@ function node_save(&$node) {
 /**
  * Helper function to save a revision with the uid of the current user.
  *
- * Node is taken by reference, becuse drupal_write_record() updates the
+ * Node is taken by reference, because drupal_write_record() updates the
  * $node with the revision id, and we need to pass that back to the caller.
  */
 function _node_save_revision(&$node, $uid, $update = NULL) {
Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.924
diff -u -F^f -p -r1.924 user.module
--- modules/user/user.module	21 Sep 2008 15:08:39 -0000	1.924
+++ modules/user/user.module	23 Sep 2008 21:13:27 -0000
@@ -201,7 +201,7 @@ function user_load($array = array()) {
  *
  * @param $account
  *   The $user object for the user to modify or add. If $user->uid is
- *   omitted, a new user will be added.
+ *   omitted (or $user->is_new == TRUE), a new user will be added.
  *
  * @param $edit
  *   An array of fields and values to save. For example array('name'
@@ -234,7 +234,10 @@ function user_save($account, $edit = arr
     unset($edit['pass']);
   }
 
-  if (is_object($account) && $account->uid) {
+  if (!isset($account->is_new)) {
+    $account->is_new = empty($account->uid); 
+  }
+  if (is_object($account) && !$account->is_new) {
     user_module_invoke('update', $edit, $account, $category);
     $data = unserialize(db_result(db_query('SELECT data FROM {users} WHERE uid = %d', $account->uid)));
     // Consider users edited by an administrator as logged in, if they haven't
@@ -245,7 +248,7 @@ function user_save($account, $edit = arr
     foreach ($edit as $key => $value) {
       // Fields that don't pertain to the users or user_roles
       // automatically serialized into the users.data column.
-      if ($key != 'roles' && empty($user_fields[$key])) {
+      if (!in_array($key, array('roles', 'is_new')) && empty($user_fields[$key])) {
         if ($value === NULL) {
           unset($data[$key]);
         }
@@ -326,7 +329,7 @@ function user_save($account, $edit = arr
     // fields from being saved there.
     $data = array();
     foreach ($edit as $key => $value) {
-      if (($key != 'roles') && (empty($user_fields[$key])) && ($value !== NULL)) {
+      if (!in_array($key, array('roles', 'is_new')) && empty($user_fields[$key]) && $value !== NULL) {
         $data[$key] = $value;
       }
     }