function __getCategories()
{
  $cache_name = "views".DS."categories-list.php";
  $cache_expires = '+24 hours';

  $cache_data = cache($cache_name, null, $cache_expires);
  if (empty($cache_data))
  {
    $list = array_merge(array('categories'=>'All Categories'),
            $this->Contest->getEnumValues("contest_category"));
    cache($cache_name, serialize($list), $cache_expires);
  } else {
    $list = unserialize($cache_data);
  }
  return $list;
}