Apologies for the short notice, as this one was only added to the schedule very recently.
Today, RIGHT NOW, it's firewalld Test Day in #fedora-test-day on Freenode IRC. firewalld is a dynamic firewall daemon which provides a modern alternative to the iptables system for managing kernel-level firewalling. It allows for much more flexible and powerful application control of the firewall, and allows for changes to happen on the fly without the firewall being 'recompiled' every time.
The firewalld developer, Thomas Woerner, hopes to have firewalld included by default in Fedora 17, if the results of the Test Day are positive, so it would be very helpful to get some wider testing of firewalld from the Fedora community. It's pretty easy to test, and all you need is a Fedora 17 system of some kind - a virtual machine or live image should work fine. Full testing instructions are available at the Test Day page.