I've been using NetBarrier for a couple months and for the different FW's I've had (mac's osx & Norton) it is the best. I'm no network wizard, and one of the best features of Netbarrier is that you can start off blocking all applications from communicating from your computer. As applications want to communicate, NetBarrier can ask you if you want to allow and you can say yes or no. It's ironic that on the Windows platform, ZoneAlarm (which is free) will do this. But on the Mac platform this is the only application I've found that does this.

2 suggestions:
1. It would be nice to say, allow application to connect for x amount of days. This would protect against anytime when I want to add an apllication for a day but forget to take it off.
2. It would be nice to see all the connections that are happening or current or some kind of graph that shows the last couple connections, or queue that shows what has been making connections. This would help me to see if any suspicious activity is going on.

Great job on the product!