The Subject Watcher script allows you to be notified (via sound or text) when a certain phrase appears in someone's tell on the server. Here is the information you need to add the script:

• Script Type: BeanShell.
• Event Type: Chat
• Event Subtype: You will certainly want "Channel Tell" here and probably "Personal Tell" as well. Add any of the other ones if you want as well.
• Code for audio notification:

  import jregex.*;
  
  String subject = "hello world";
  String soundFile = "C:\\tmp\\sound.au";
  
  Pattern pattern = new Pattern(".*\\b"+subject+"\\b.*", "i");
  if (pattern.matcher(message).matches())
    playSound(soundFile);
  

  Code for textual notification (in the console):

  import jregex.*;
  
  String subject = "hello world";
  
  Pattern pattern = new Pattern(".*\\b"+subject+"\\b.*", "i");
  if (pattern.matcher(message).matches())
    appendLine("\""+subject+"\" is being discussed");
  

  In both pieces of code, replace the subject's value for your own phrase. In the first example, also replace the value of the sound file to some file on your disk.
  Note: If you're running Jin on Windows with Microsoft VM, you can only use .au sound files. If you want to be able to use wav or MIDI files, you need to install Sun's Java and run Jin with the "Jin (Standard Java)" link.