As you may or may not have noticed, the 10.5.6 Mac OSX update disabled the ability to unlock and jailbreak your iPhone/iPod Touch. Here is a guide that fixs this for you. Watchout, people have been having big problems with their Mac OSX 10.5.6 computers. They stop working. Make sure you uninstall this afterwards.
Anyways, onto the guide:
To download: CLICK ME