A couple of weeks ago, there was controversy over showing the ball. Tricky rule and hard to call, but the rule states, "The pitcher must show the ball, no less than one second and no longer than ten seconds."
Unfortunately, that isn't what the rule says - the first part any way. It doesn't say anything about showing the ball. That's the whole "presentation" myth that rears it's head every now and then. The rule says that the "hands must come together" for no less than one second and no more than ten seconds. The pitcher is never required to "show" the ball. She has to step on the plate and take her signal (or simulate taking a signal) with her hands apart. She can do so with the ball in her glove. The pitch doesn't officially start until the hands break (the 1-10 second aspect), and if the ball isn't visable to anyone before the hands separate, she is perfectly legal.