CheckPoint's ZoneAlarm firewall has been updated for Vista compatibility, quite a ways post the Vista release. Version 7.1 of the firewall suite, one of the more popular software offerings, brings this added support. This makes it the first incoming and outgoing software firewall that is fully compatible with Vista.
Both the paid version and the free version of the software have been updated. If you're looking for something stronger than Vista's built-in firewall and don't have a hardware solution, this is definitely one to check out. You can download the software from the Zonealarm site, though as of this article they were presenting the 7.0 suite rather than the update.
