They talk about using Comodo Firewall on Vista in their radio show.
The show is not that impressive to me anyway, but they should at least research products before they talk about them on their show. I would hate for people to try it on Vista because of that and think poorly of it because it does not work properly. If they were experienced enough to have that show, then they would realize that their are very few 3rd party firewalls that are compatible with Vista at the moment.
I emailed the site about this, but they still have the link to Comodo Firewall and have not put up anything saying that it is not for Vista.