ipfwPane is a Preference Pane for Mac OS X 10.5 Leopard, it gives you back control over the packet based firewall from the Tiger days. For more information, screenshots and downloads please visit the website at pixelshed.net/ipfwpane.
The current version has the same features like Apple's original Preference Pane. I am currently planing to extend the features a bit to give users who want it more control over ipfw while keeping the UI simple. (See TODO.txt for what is planed.)