Does the new firewall just work?

I'll be honest I had no worries with the firewall in 10.4 I just turned it to on and that was the last I thought about it.
I see no such simple operation in 10.5, infact I am quite confused.
So, is it on or not? If I set it to specific is it on now?
When is it exactly on?
http://homepage.mac.com/garethirwin/.Pictures/firewall.png
Is my screenshot for instance on or off? If I set to block all incoming is it now on, or have I stopped all internet use? If I set it to specific things, what do I do now is it on?
Most confusing and in my opinion a mistake by apple.
10.4 = on or off
10.5 = If you are an expert on such matters you may know, or you may not.

Hi
I've interpreted it as follows, which I believe is correct:
Allow all incoming connections - Firewall is off
Block all incoming connections - Firewall is on
Set access for specific services and applications - Firewall is on, with certain 'holes', required for the specified services
I've blocked all incoming connections and haven't had any problems with internet use. I can still browse the web, send and receive emails, perform a software update and my dashboard widgets still get updated etc. I assume all of these are initiated via outgoing connections, whereas Firewalls tend to be associated with incoming connections.

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