There are similarities present between the two are probably more than you'd think. After all, the main goal in both pitching and boxing is to get your hand to a certain point (release or landing the punch) with as much force and velocity as possible. That involves rotation of the hips and shoulders, as well as extension of the elbow (but not locking out).
Maybe I was a little vague in my post Roger, sorry for the confusion. I am not advocating that pitchers take up boxing. A pitcher isn't going to throw a pitch from in front of his jaw, and a boxer will never punch from behind his shoulder, so there will always be fundamental differences. What I meant to suggest is that pitchers might be able to benefit from a boxer's strength training regimen- which is heavily influenced by "rotational" types of exercises. The hips, which I think we can both agree that the hips play a large role in generating power for a pitcher, are targetted frequently in a boxer's program. One of the most interesting is the mix of weight training (barbell squats) with explosivity training (jump squats).
It might not be revolutionary to strength guru's, but I think a lot of HS coaches and athletes get hung up on maximal strength. This subforum gets a topic almost once a week about whether or not doing heavy bench presses or bicep curls will help them gain MPH's on their fast ball. That just is not the case. Speed strength is what counts. And when it comes to training for applicable speed strength, I have not found any methods that will touch a boxer (and I say that with all due respect to every other sport).
And to Roger and Mike, I think we all essentially agree. I was just trying to develop my thoughts into something somewhat useful. We are each coming from different areas of experience, but speed strength ("rotational" and so on) is something we can agree on, right?
Sorry for such a long post, I got to rambling...