As I said back when Nintendo first announced that they were offering downloadable games as rewards for Club Nintendo members, they're going to rotate the offerings. So if you wanted any of the first batch, I hope you already redeemed your coins, because it's too late. They're gone. (I mean, you can still buy them for download, but spending free coins instead is no longer an option!)
There are four new games on offer, two for the Nintendo 3DS and two for the Wii. For your handheld, you can get Dr. Mario Express for just 150 coins, and Kirby's Dreamland for 100 coins. Over on the console side, there's Dr. Mario Online RX for 100 coins, and The Legend of Zelda: Majora's Mask for a measley 150 coins.
But remember, these games are only available for a month, so if you're interested, you've only got until January 31 to redeem your coins!