There is a built in firewall in system preferences>sharing>firewall, just turn it on.
Aside from that, i understand that Norton can actually do damage to your mac, so i cant recommend that. I occasionally scan my hard disk for virus/spyware ect using chamXav (i think thats what its called) which is an open source anti virus app, and it shows me all the windows viruses that arrive in spam mail messages.
I agree with you that macs aren't entirely safe from this sort of thing, but theres nothing nasty out there yet.
cheers
charlie
Aside from that, i understand that Norton can actually do damage to your mac, so i cant recommend that. I occasionally scan my hard disk for virus/spyware ect using chamXav (i think thats what its called) which is an open source anti virus app, and it shows me all the windows viruses that arrive in spam mail messages.
I agree with you that macs aren't entirely safe from this sort of thing, but theres nothing nasty out there yet.
cheers
charlie