Those who reached Gold status (300 coins or more since last July) get a calendar, and Platinum status holders (600 coins or more) get this neat Mario figurine thing. To claim your reward, you have to sign into Club Nintendo and provide a shipping address. The prizes will ship by the end of this year, according to Nintendo.
And now ... the process begins again. It's time to start registering games for next year, like that copy of Sin & Punishment you were just about to buy.