Just so Jer9Ball isn't the only one who gets roasted in this thread, I'd like to say I don't believe in "systems", either. Aiming is NOT a science, and no "system" can account for all variables in aiming. Ask pros how they aim, and they'll either come up with some bullshit answer or they'll be truthful and say, "I don't know."
People can say they use systems all they want, but aiming is nothing more than fine-tuned intuition. Beginners use systems to try to get to the point where aiming is intuition, but as players advance, aiming stops being a conscious thought exercise and turns into an unconscious act. As Jer9Ball said, he looks at the balls and shoots. I do the same thing.
Here are some questions to think about. Do you think Pedro, Clemens, Johnson, Santana, etc., use a "system" for pitching? Do you think they consciously think about foot position, grip pressure, release points, leg kick, humidity, and wind speed when they pitch? Do you think when Vick throws a football he's thinking about inertia (as a side note, do you think he can spell "inertia"

), air density, altitude, MPH, and drag coefficients?
When these guys were learning to do the things they do, I can guarantee somebody taught them a standard technique (or "system" if you will). LEARNING a task requires a methodology. Once the methodology is MASTERED, though, conscious thought is no longer required. These guys don't have to think about all the crap because they've learned it and ingrained it. In the process, they've incorporated the standard technique into their own technique unconsciously. This is true in everything. Take driving a car, for instance. We had to be taught how to use the parts of the car, such as brakes, gears, steering wheel, gas pedal, etc. After driving a certain amount of time, no conscious thought is necessary to drive a car - it's second nature. When learning to drive a manual, you constantly have to think about choosing the right gear, upshifting, downshifting, etc. Once again, after a certain amount of time, that becomes second nature, and conscious thought becomes unnecessary. And guess what, everybody who masters a task does it different from everybody else! No two pitchers have exactly the same motion. No two drivers drive exactly the same. No two golfers have the same swing. They've all taken the same basic information and methodology and uniquely come up with their own solution, thus throwing the "system" out the window.
-djb