It might not be common knowledge that nearly every Big League baseball park in America has a system that can track a pitch's movement, break, release point, starting/finishing velocities, and a host of other details. And for some reason, Major League Baseball compiles and archives all of this data for public consumption on their website.
And it's all for free! I know, something for nothing. It doesn't seem quite right, considering that this is the American pasttime and all.
Anyway, there's a ton of data to look at. A ridiculous amount. People analyze this stuff for a living and I don't think anyone's even scratched the surface of what it can reveal about the nature of the game.
Because the data is stored very inconveniently on the MLB servers (in a weird esoteric directory structure), the average fan effectively doesn't have access. And based on the way most MLB games are managed, I sort of doubt that even the experts have adequate access. You see, the files are really only accessable to a small percentage of the population:
Baseball is different than many spectator sports because there are relatively few intangibles. Every possible action is decided by some variant of bat-hits-ball, and now that we have access to the flight path of every pitch and how each individual batter reacted to it, there's room for a lot of insight that hasn't been made before.