Index: user.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.admin.inc,v
retrieving revision 1.30
diff -u -p -r1.30 user.admin.inc
--- modules/user/user.admin.inc	19 Oct 2008 21:19:02 -0000	1.30
+++ modules/user/user.admin.inc	20 Oct 2008 03:58:54 -0000
@@ -184,6 +184,8 @@ function user_admin_account() {
     $form['last_access'][$account->uid] =  array('#markup' => $account->access ? t('@time ago', array('@time' => format_interval(REQUEST_TIME - $account->access))) : t('never'));
     $form['operations'][$account->uid] = array('#markup' => l(t('edit'), "user/$account->uid/edit", array('query' => $destination)));
   }
+  // Remove uid1 from the $accounts array so it can't be accidentally deleted.
+  unset($accounts[1]);
   $form['accounts'] = array(
     '#type' => 'checkboxes',
     '#options' => $accounts
Index: user.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.pages.inc,v
retrieving revision 1.22
diff -u -p -r1.22 user.pages.inc
--- modules/user/user.pages.inc	13 Oct 2008 00:33:05 -0000	1.22
+++ modules/user/user.pages.inc	20 Oct 2008 03:58:55 -0000
@@ -238,7 +238,7 @@ function user_profile_form($form_state, 
   $form['_category'] = array('#type' => 'value', '#value' => $category);
   $form['_account'] = array('#type' => 'value', '#value' => $account);
   $form['submit'] = array('#type' => 'submit', '#value' => t('Save'), '#weight' => 30);
-  if (user_access('administer users')) {
+  if (user_access('administer users') && $account->uid != 1) {
     $form['delete'] = array(
       '#type' => 'submit',
       '#value' => t('Delete'),