If you answer a question - or have a question you asked answered by someone - please remember to edit the page and set the status to answered. The status is in a drop-down list below the edit box.
This is a manual affair. You have to disable the user from whatever authentication that you are using currently. You can delete the user's homepage if you are so inclined.
-- ZakaiKinan - 19 Jun 2007
See ManagingUsers#Removing_User_Accounts
-- PeterThoeny - 19 Jun 2007