Joey Votto won the NL MVP on Monday, partly due to an adjustment he made after the 2008 season. Joey already produced power, but he upped his OBP in 2009, taking his game to the next level.
In 2008, Votto tended to go after high pitches. The following chart shows his strike rate that season.
Note the dark yellow blob above the middle of the strike zone. That disappeared over the two years: