slimeslurp

I’ve created a custom BuildListener for Ant that provides Growl notifications when your builds start/stop. It uses the JGrowl library to send messages. JGrowl also provides a Growl like notification system for any Java platform. I’ve also created an Ant task similar to <echo> that lets you send messages to Growl during your builds.

You can get it here:

http://code.google.com/p/growlbuildlistener/