AFAIK avahi IS started automatically. There is a script in /etc/network/ifup.d that starts it when you are connected to a network and another scritp in /etc/ifdown.d that stops it when you disconnect.
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N900: One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
How can I let the device start this daemon
Nokia N810 FW version 5.2008.43-7
iPad 2 (iOS 4.3.2) Macbook Pro (10.6.6)
Nokia 5800 phone FW 62.0.0125