If you have a Nintendo DS or Wii, chances are you also buy games for those systems (otherwise what's the darn point of having the game system?!). Well if that's the case, you should head over to Club Nintendo, sign up for a free account, and then collect all the game cases and start looking through them. Inside each case should be a little sheet of paper with a registration code printed on the back. Enter it into your Club Nintendo account and you'll get 50 coins for each Wii game and 30 coins for each DS game. Then you can cash out the coins for free Nintendo swag or even a free DS game. My family had just enough games to earn 800 coins, so they cashed out and have a free game coming to them in the mail!