Osu!
Brilliant new Ouendan/EBA simulator: http://osu.ppy.sh/
It's a bit hard to get used to playing with a mouse, and it doesn't help that most of the songs are painfully hard, but it's still fun. It's awesome how easy it is to edit tracks, though. I even made a couple of my own:
http://osu.ppy.sh/forum/viewtopic.php?f=6&t=394 Pretty easy
http://osu.ppy.sh/forum/viewtopic.php?f=6&t=392 Kind of hard, but short
It's a bit hard to get used to playing with a mouse, and it doesn't help that most of the songs are painfully hard, but it's still fun. It's awesome how easy it is to edit tracks, though. I even made a couple of my own:
http://osu.ppy.sh/forum/viewtopic.php?f=6&t=394 Pretty easy
http://osu.ppy.sh/forum/viewtopic.php?f=6&t=392 Kind of hard, but short