http://club2.nintendo.com/program-notice/

Nintendo Club is closing at the end of June, at that time all accounts will be terminated. If you've registered games and earned coins you haven't spent (or haven't registered them yet) now would be the time. They added a bunch of games for download and some cool collectibles to give people something worthwhile to spend coins on.

https://club.nintendo.com/rewards.do

The Majora's Mask/Fierce Deity Link jigsaw puzzle is of particular note:

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Some stories can't be told with words, some legends are meant to die

I had over 3 dozen games to register but the site is still so broken that I can't do my post gameplay surveys for extra coins. At least I spent the majority of my coins already.