Another cool surprise at E3? Elite Beat Agents for the Nintendo DS.
It features the best elements of wacky Japanese game design, such as beats and agents. During one gameplay sequence, I could swear someone was kicking a baby.
Elite Beat is a rhythm-based game. It's simple, but fueled by really cool songs. Circles appear on screen with other, shrinking circles appearing concentrically. When the two circles overlap, you must use the DS' stylus to touch the circle, thus ensuring you are in fact, not a complete loser.