Google is introducing GMail Motion that allows nonverbal cues to command your programmes. It's definitely worth seeing their pitch of this, which is just 1:53. Now, everyone can act like a baseball umpire or referee. Before you get all fail whale on their asses, hear this out.
Twitterversion:: [video] Google 'introduces' GMail Motion w/demo—nonverbal gestures command your software. #Fail or genius. You decide. @Prof_K