Members Only
If you like Nintendo as much as I do, you should sign up for Club Nintendo and register all your official Nintendo games to earn coins. Thanks to some help from my brother (we have a "family account") I will soon be receiving the following reward via mail:
Congratulations! Your reward order has been placed. Reward: Game & Watch Collection Coins Redeemed: 800
The Club Nintendo prizes are cool mainly because they are not available at all on the market. If you get a Club Nintendo prize, you are getting something that non-members are unable to get (unless they buy it off of a member on eBay). Being that I'm a chronic, rabid collector of random things, I'm the perfect person for a program like this. More trivial information: Club Nintendo has been around for years in Japan and Europe, but is barely one year old in the USA. The "coin" to dollar ratio is about 1:1, meaning that 800 coins basically translates to $800 worth of purchases. That may sound like a lot, and it is, but that's still far less than what my brother and I spend each year on video games, and when you spend as much as we do, it's nice to get a little reward. Once I finish registering some more games, I should be able to get a Nintendo-themed Hanafuda card set… just like the ones Nintendo first made when they started out 
p.s. Now for the crazy part: if you are reading this post and thinking, "well, that's nice, but I only have a few Nintendo games and I don't plan on signing up for some gimmicky rewards program," you can still take part in the action. If you are not going to use your product registration codes, send them to me! I know this sounds like crazy talk, but let's face it: your trash is my treasure. Just look inside the product boxes for your Nintendo games, or find the serial # on the bottom of your DSi, and ask yourself… "am I going to put this to good use?" If the answer is no, then by all means, send those numbers to me and I will put them to good use. I'll also thank you immensely.
p.p.s. I haven't been posting much lately because I'm teaching myself how to make Flash games. It's fun times.
… I still need to find my other codes. I'm only at 50$(by you conversions, sir)