Baseball Confidential talks about pitchers, catchers, players, coaches and managers so I thought this historical tid-bit would be of interest:
On the day, November 19 in baseball history:
1884 - The National League agrees to allow overhand pitching, but rules that pitchers must keep both feet on the ground throughout their pitching motion in order to reduce the velocity of their pitches. They still must throw the ball at the height requested by the batter. In addition, teams are now required to supply a separate bench for each club at their park to limit inter-team fraternization.
1888 - The Joint Rules Committee reduces the number of balls for a walk from five to four, establishing the four balls/three strikes count that remains in effect to this day. It also eliminates an out on a foul tip if the catcher catches it within 10 feet of home plate.