http://o2jam.e-games.com.my/

I've been playing this game for the past few days and it's pretty fun. Works your hand eye coordination. It's like beatmania, but online multiplayer. This is a video of someone playing my favorite song on the game:

http://youtube.com/watch?v=v-fD1iRnTgc

hmm this is almost as similar to the guitarfreaks layout, I play stepmania keyboard stuff, but this one looks a tab dit harder and interesting, I'll give it a try