Using Web Spy we monitoring our organizational web usage. We use BT ISA filter for most content blocking and block all incoming ports except 80, 443 and 25. The problem is everyday it seems users are able to find new some new chat mechanism. The latest was phonefox and e-messenger.net. Chatting is in clear violation of policy. All users have signed computer user agreements. Short of sending out termination letters to every employee that violates policy is there another way to win the battle of these port 80 chatters?