You do need Bonjour/Avahi running.
I’ve just been playing with Firefly on an Ubuntu 8.04 build and the default Avahi config caused me a couple of minor problems not least that my eth0 interface wasn’t communicating after boot – in the /etc/avahi/services/daap.service XML file I restricted the service to IPv4 ( ) and in the /etc/avahi/avahi-daemon.conf file I set ‘use-iff-running=no’. Which of these two points fixed the eth0 issue I’m not sure but both made sense and cured my initial problem.
There’s an example for the service file here
I used this page for some instruction but ignored the firestarter stuff.