I’ll admit that, so far, I’m not a big fan of the 9.04 notification system. It does remind me a lot of OS X “Growl”, but the lack of customization options make it frustrating at times. I do hope that the developers continue to improve on the system as I think it could be a very nice tool given a little more attention.
In the meantime I have disabled Pidgin from using it. I don’t need every inbound IM and status change to be displayed for all to see.
Read more at Ubuntu Tutorials