system
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I don’t think a firewall is “very common” for an antivirus-program.
Since WinXP SP2 (RC1) has a build in firewall most people don’t really need a firewall in the future. And even if there are better personal firewalls (sygate, tiny, kerio) on the security-market the demand for such a software will be low (I think) due to the fact that everyone will have a build-in-firewall with SP2.
So in my eyes a firewall in avast! would only bloat the system 
Greetings
Timo
p.s. the only virus-program with integrated firewall (and dialer-control) I know is Softwin Bitdefender Professional - but this costs extra cash
