Ok, I have pretty similar hardware as you do (Airport original card). Here are the facts as far as I understand them:
1) Ubuntu (and many other Linux distros) support WPA and WPA2 out of the box with many hardware configurations. The issues is whether the linux driver for the network chip supports them. I use WPA2 daily with Ubuntu.
2) For Airport it does not. There is a hacked driver that people have been successfully used in Intel hardware. I and as far as I can tell, no one else, has been successful in getting it work to work on a PPC hardware. If anyone manages do that it would be great.
3) You could buy a USB stick wireless card that is Linux compatible and get WPA2 to work with minimal hacking.
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