I don't want this to be subjective, so I'll try to make the requirements as clear as possible.
On a Mac with Snow Leopard, how can I set up the firewall rulesets that allow ONLY:
Using the internet through standard browsers (Safari, Chrome, Firefox), software updates, Skype, iTunes, and ftp access to upload data to a web site.
No need for Mobile Me, iCal, address book, iChat, etc.
If the ftp access presents a big hole in the firewall, then I'd rather use a separate PC to do the uploading, but I think I can simply open the port for that, correct?
So basically, everything else is blocked.
An example of rulesets I'm looking for is: ipv4, deny ip from 127.0.0.0/8 to any in, for both ivp4 and ivp6.
I've read through much of the documentation for the firewall, and searched through information on several sites, but it's all very cryptic to a security noob.