Shard

Its not 1 million users for just 3 games. Theres only 3 wifi games in America, but theres a few more out in Japan. Bleach DS is the only one I can name off the top of my head though.

#5 I remember reading last year that someone had made a touchscreen that vibrated slightly, when someone was touching a button on the screen, to give it a slight tactile feel. And it's able to vibrate differently for different buttons so you wouldn't have to look to know what you were pushing. I believe they were testing them in cars...I'll have to see if i can find the article. It may be annoying and cause discomfort if your button mashing, but it is an option.