I prefer COMODO Personal Firewall over Zone Alarm Free. Works great with AVG here.

Also, about AOL Kaspersky... sounds promising, but I don't use my paid version of Kaspersky 6 because I had some issues with it. They were known and I was sick of waiting for them to fix them. I do think they are addressed now, but I have been happy with AVG Free for a couple months. No intention to switch back yet.