Thanks!
One more question: In North America, how far back do games have codes in them? I know the program wasn't started until 2008 here but could I still get points on, say, Gamecube games or early DS games?
Wii or early DS games -- yes. GameCube and GBA had registration codes, but they aren't worth any points on Club Nintendo.
If you want to verify which games are eligible, check out the Club Nintendo Coin spreadsheet I put together (with lots of help from Clipper): http://codebook.potchgult.com/clubnintendo