Hi, often you may run boxee in the background while working away. I find it would be pretty nifty if it could send a global notification via Growl(Leopard) or via Mumbles(Ubuntu) to inform me about the track change.
Growl and Mumbles should be very easy to support since they have a simple CLI tool you can pipe text to.
Links to the notification tools.
Growl - http://growl.info/
Mumbles Project - http://www.mumbles-project.org/