I like playing againts a human opponent in Wii Sports Baseball and throwing pitches normally for most of the game. Then when it gets to the end, I whip out my new strategy. I start pitching the ball really fast. Sometimes I can get the pitch up to 99MPH.
I can’t do this with regular arm movement though. The trick is, instead of making your arm move like you are throwing a pitch, just aim the wii-mote at the ceiling and wave it around in a circular motion really fast. This will make the pitcher throw the ball really fast.