http://secunia.com/mac_os_x_command_execution_vulnerability_test/
Doesn't work on my G5... I think this was a vulnerability that was found about two years ago and patched.
I also tested my computer on the test the guy who claims to have discovered its site... didn't work there either. I tested it on five other Macs today... none were vulnerable.
Basically, its another Trojan proof of concept.