Video Games: Leveling Up: Tournaments
It's so easy to have a tournament. I set up 3 minute quarters to make the games go by fairly quickly. I had the kids pick teams out of a hat. FIFA Soccer or Forza Motorsport racing games work well too.
I also had a contest one day to see who could make the biggest ball of stuff and gave out prizes. I just used the demo of the game as it gave each kid 3 minutes.
New Rock Band and Guitar Hero!