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As SABnzbd seems to have Growl support, I installed growl for linux ("gol") on my Ubuntu (see http://mattn.github.com/growl-for-linux/ for source). See below how.
gntp-send 'hey there!' 'this is an important message ...'
... and that message appears in a pop-up on my Ubuntu screen.
So far I've not seen SABnzbd messages on my growl-screen :-( Maybe time to play with the growl settings in sabnzbd.ini? Or does SAB's growl only work on Mac OS X?
I did a "git clone -b develop git://github.com/sabnzbd/sabnzbd.git" to sab070, run it , and ... I have popups. But wait ... double popups: in the right lower corner from gol, and beautifull popups in the upper right corner. So some more research: sab070's config https://localhost:9090/sabnzbd/config/notify/ shows the options for Notifications:
Enable NotifyOSD
Enable Growl
Both were checked. Ah, that explains the double popups: the beautiful pop-ups are NotifyOSD, the less beautiful pop-ups are Growl.