You can register any game that came with a registration card and code. Not all of those will allow you to earn points, though - just a select list of recent Wii, DS, and Wii Shop Channel software which have surveys attached to them. Everything Nintendo publishes from here on out will have surveys though.
Information on the games you can earn points from is found here:
http://www.nintendo.com/consumer/club/en/faq.jsp#vers
There's a list of specifically which games have surveys available towards the bottom.