How to claim your custom Nintendo ID
You can now claim your custom Nintendo ID. Make sure you claim it before someone else takes your name. A Nintendo ID is essentially your Nintendo Gamer Tag and it will now [FOR THE FIRST TIME EVER] allow you to link digital purchases to your account, rather than your hardware. This means there is a good chance that when Nintendo make a new console, you will be able to re-download your purchased digital games onto that console so long as you are using the same account information.
... and disable advertisements! No kidding :)