The big problem with things like ZA is that because it runs on the PC, it can be compromised via spy/malware.
I am sure they thought of this, but something to keep in mind.
What I would like to see is a consumer hardware firewall with the ability to write point to point rules. Where you can specify src and dst IP and such. Along with some basic traffic accounting. All the software products I have seen for Linksys are pretty much crap.