Bring on the replay

It seems Major League Baseball is trying to implement an instant replay system to ensure that every ball that's a home run is called a home run, and every ball that isn't a home run isn't called a home run.

My response: What the *#^& took them so long?

Baseball is the only major North American professional sport that doesn't have some sort of replay system. I'd like to see it used for close calls on the bases, fair vs. foul, fly balls that may or may not have been caught before they hit the ground, etc., but this is a good start. I'm very surprised that it's apparently going to happen in the middle of the season, but also very pleased.