$visitors = Mage::getModel('log/visitor')->getCollection()
foreach ($visitors as $visitor)  {
    print_r($visitor->getData());
}

$read = Mage::getSingleton('core/resource')->getConnection('core_read');

      $results = $read->fetchAll("select * from log_visitor_info");

      foreach($resulst as $res)
        echo $res['http_referer'] . " - " . $res['http_user_agent'] . " - " . $res['remote_addr'] . " - ";