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Do they do it with a super high speed camera, or inject a tiny gyroscope and computer into a golf ball?  Wouldn't the itty bitty computer get smashed with smash factor?  
I've heard rumors that Raul Ibanez put a favorable spin on his hits, but these are some of the secret things that we aren't allowed to know about in baseball.  It really begs the question of what spin data is out there, and what else we don't know.  That site was really cool.  There is an Excel baseball projection calculator on it that looks like it takes about a month to figure out.  The baseball calculator takes air resistance and magnus force into account as well as angle and trajectory.  You just plug in what you know, and it figures out the rest for you.  I wish he made a version for dummies without all the variables.  We need a non PhD version.