Calvin Crowner mentioned that an action is already taken on the latest producer's update:
From Producer's Update - 9/10/2010:
What’s going on with 3rd party program detection?
This week the first series of actions took place on 3rd party program use offenders. I will not share numbers or specifics on account names, locations of offenders, or how often we will take action.
Criteria for taking action are based on frequency of the offense. For example, account X was found using program Y, Z number of times. This implies that the account/player willfully violated the terms of the game. High frequency violators will be removed from the game. Low frequency violators will be warned and in time suspended if the offense continues.
Flames, vegetable throwing, and other creative methods of termination and suspension are not currently planned.
UO Assist and UOAM are sanctioned applications.