Apple Update the iTunes to version 9.1.1!
According to MuscleNurd from dev Team, jailberakers should beware of this update until the next releases of jailbreaking tools.
Today’s 9.1.1 iTunes is safe for PwnageTool&redsn0w. But those hoping to use userland JBs (like Spirit) should hold off.
In general, those using *any* userland JB should avoid iTunes updates, since iTunes can detect & remove it.