BlueJ
This forum is AWESOME!
Nintenpedia is a wonderful forum that allows you to earn eShop codes and other gift cards by participating in the forum. I have been a member for four years now, and while I haven't directly gotten a gift card yet, I have seen enough payment proof to prove that this is a legitimate business. The best part about Nintenpedia is the people that you can meet and talk to. The staff are wonderful, and they can help you out with anything that you need. Beyond the official store (where you can redeem your coins) there are also loads of stores where you can trade your coins in exchange for goods or services. This site is incredible, and I would love to see it go on for as long as possible