I’ve been using the jQuery plug-in “toastr” for quite some time as a basic growl/notification system. As a basic service, it’s dead simple to wire up. If you don’t know what this plug-in does, check out the demo of it.
But, I found that I needed more interactivity than basic hide/show messaging scenarios. I needed to be able to render full templates inside of the toast messages to allow for interactivity bound to DOM events.