I use growl on my mac - but I haven't browsed the site in ages. Today, from del.icio.us I found this gem: GrowlNotifier class (Python) I am going to use the hell out of this. Python bindings for Growl? Heck yeah!
Some notes for myself: Make sure to view the scripts and Extras folders, and also enable "remote notification" in the preference pane.
This will be incredibly useful for tracking network events - also, it'll be kind of cool. I need to make a bugzilla growl plugin to tell me when new bugs hit my queue (but that's redundant with email notifications, I know.)