No surprises in the firewall department: This time ZoneAlarm Pro joins Norton Personal Firewall 2004 for the distinction. Both provide excellent protection, are highly customizable, and work with little fuss. Both also give you a decent ad-blocking feature. Nortons firewall adds protection for specified data, while ZoneAlarm is more tightly integrated.
Personal Firewalls: Norton Personal Firewall 2004; ZoneAlarm Pro 4.0
Symantec's Norton brand gets the triple crown in personal security software this time around, joined only by ZoneAlarm Pro 4.0 in the firewall category.