Voyeur is a very small bit of ruby code that I’ve written to display updates to your MPD stream via Growl.
You can find it here: http://kill-0.com/voyeur/
You start and stop it as you would a daemon, ie $ ./voyeur start and ./voyeur stop. As an added bonus, you can send it a HUP signal, and it will immediately display the current track information or status. Here’s a screen shot:
