=== modified file 'modules/user/user.module'
--- modules/user/user.module	
+++ modules/user/user.module	
@@ -690,14 +690,14 @@ function user_menu($may_cache) {
 
   if ($may_cache) {
     $items[] = array('path' => 'user', 'title' => t('user account'),
-      'callback' => 'drupal_get_form', 'callback arguments' => array('user_login'), 'access' => TRUE, 'type' => MENU_CALLBACK);
+      'callback' => 'drupal_get_form', 'callback arguments' => array('user_login'), 'type' => MENU_CALLBACK);
 
     $items[] = array('path' => 'user/autocomplete', 'title' => t('user autocomplete'),
       'callback' => 'user_autocomplete', 'access' => $view_access, 'type' => MENU_CALLBACK);
 
     // Registration and login pages.
     $items[] = array('path' => 'user/login', 'title' => t('log in'),
-      'callback' => 'drupal_get_form', 'callback arguments' => array('user_login'), 'access' => TRUE, 'type' => MENU_DEFAULT_LOCAL_TASK);
+      'access' => !$user->uid, 'type' => MENU_DEFAULT_LOCAL_TASK);
     $items[] = array('path' => 'user/register', 'title' => t('create new account'),
       'callback' => 'drupal_get_form', 'callback arguments' => array('user_register'), 'access' => !$user->uid && variable_get('user_register', 1), 'type' => MENU_LOCAL_TASK);
     $items[] = array('path' => 'user/password', 'title' => t('request new password'),
@@ -779,6 +779,9 @@ function user_menu($may_cache) {
     // Add the CSS for this module. We put this in !$may_cache so it is only
     // added once per request.
     drupal_add_css(drupal_get_path('module', 'user') .'/user.css', 'core');
+    if (arg(0) == 'user' && !arg(1) && $user->uid) {
+      drupal_goto('user/'. $user->uid);
+    }
 
     if (arg(0) == 'user' && is_numeric(arg(1)) && arg(1) > 0) {
       $account = user_load(array('uid' => arg(1)));