There is a new notification plugin available. This plugin integrates notifications with Snarl which is a cool notification system and is like a central repository where applications can send various events/notifications and Snarl will popup the information in its own skinned windows.
The new plugin can be downloaded here:
http://www.poppeeper.com/Plugins/notify.php
And you will need to download Snarl as well (free):
http://www.fullphat.net/index.php
(at the time of this posting, I recommend that you download the non-beta version, v2.1, and not v2.2 pb1)